Defibrillators · R Series family

ZOLL R: troubleshooting and error codes

The ServiceForge knowledge base holds 150 documented symptoms for the ZOLL R, with 290 ranked causes, 307 diagnostic checks with test points and expected values, and 214 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Excessive artifact with paddles as ECG source

Paddles used as ECG source show excessive noise or artifact on display

Ranked causes

1. PADDLES not selected as ECG source (common)
2. Paddles not pressed firmly on patient (common)
3. Insufficient gel on paddles (common)
4. Paddle surface contaminated or dirty (common)
5. Debris between adult and pediatric paddle plate (occasional)
6. Paddle cable damaged (occasional)
7. Poor electrode contact; use ECG electrodes instead (common)

First check

Verify PADDLES selected as ECG source

Test point: ECG source selector
Expected: PADDLES mode indicated on display

3 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Energy does not discharge when SHOCK button pressed high voltage

SHOCK button activated but no therapeutic energy delivered to patient

Ranked causes

1. Charge timeout - over 60/120 seconds elapsed in Manual mode (common)
2. Device in Sync/Remote Sync mode with no QRS detected (occasional)
3. Energy selection changed during charge or after ready (occasional)
4. Device not fully charged when SHOCK pressed (common)
5. SHOCK button not held down long enough (occasional)
6. Pads or paddles not making good contact (common)

First check

Check if charge timeout occurred

Test point: Manual mode timer and device display
Expected: Less than 60/120 seconds since charge ready

5 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Excessive artifact when using paddles as ECG source

ECG signal shows high noise and artifact when defibrillation paddles are used for ECG acquisition

Ranked causes

1. Paddles not selected or in manual mode (common)
2. Insufficient paddle pressure on patient skin (common)
3. Inadequate conductive gel on paddles (common)
4. Dirty or contaminated paddle surfaces (occasional)
5. Damaged paddle cable (occasional)
6. Electrodes provide better signal than paddles (common)

First check

Confirm paddles mode selected

Test point: Mode display or selector
Expected: PADDLES displayed as active ECG source

5 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CHECK PADS or ATTACH PADS message for defibrillation patient safety

Unit displays message indicating therapy electrodes are not properly connected or are defective

Ranked causes

1. Therapy electrodes not connected to OneStep cable (common)
2. Dried out electrode gel (common)
3. Poor electrode-to-patient contact (common)
4. Defective OneStep cable (occasional)
5. Consider using paddles if electrode issues persist (occasional)

First check

Disconnect and reconnect OneStep cable and electrodes

Test point: Cable and electrode connectors
Expected: Message clears after reconnection

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No 30J TEST OK message in manual self-test high voltage

Manual defibrillator self-test at 30 joules does not produce expected TEST OK message

Ranked causes

1. Energy not set to 30 joules (common)
2. OneStep electrode package not sealed (test with electrodes) (common)
3. OneStep cable not fully inserted into electrode connector (common)
4. OneStep cable not fully inserted into test port (test port method) (common)
5. Paddles not firmly pressed during discharge (paddle test) (common)

First check

Verify energy set to 30 joules

Test point: Energy level selector
Expected: 30 joules selected

1 more check with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No ventricular capture beat after stimulus marker patient safety

Pacing stimulus present on ECG but no cardiac response or capture beat visible

Ranked causes

1. Patient's pulse already present (common)
2. Pacing output current too low (common)
3. Electrode-to-patient contact poor (common)
4. Suboptimal electrode placement (common)
5. Wrong ECG lead selected (occasional)

First check

Assess patient's perfusion status

Test point: Patient vitals and pulse
Expected: Patient has adequate perfusion; capture needed

2 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No ventricular capture beat after stimulus marker on ECG patient safety

Pacing stimulus marker present but no cardiac response (capture beat) appears on ECG

Ranked causes

1. No cardiac output or patient in cardiac arrest (common)
2. Output current insufficient for capture (common)
3. Poor electrode contact with patient (common)
4. Suboptimal electrode placement for pacing (occasional)
5. Suboptimal ECG lead configuration (occasional)

First check

Check patient pulse and cardiac status

Test point: Patient assessment
Expected: Patient has palpable pulse or cardiac output evident

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Noisy ECG, artifact, wandering baseline

ECG display shows excessive noise, artifact or baseline drift affecting signal quality

Ranked causes

1. Poor electrode adhesion or skin preparation (common)
2. Electrode or cable movement creating artifact (common)
3. Patient movement (common)
4. Excessive radio frequency interference (occasional)
5. Inappropriate filter settings (occasional)

First check

Inspect electrode adhesion and skin contact

Test point: Electrode pads and patient skin
Expected: Electrodes fully adhered with good skin contact

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Sync marker absent or inconsistent with QRS patient safety

Synchronization marker not appearing or not aligned with QRS complex

Ranked causes

1. Device not in Sync mode (common)
2. Device in Remote Sync mode instead of Sync (occasional)
3. Wrong ECG lead selected (common)
4. Suboptimal electrode placement (common)
5. Recorder paper too narrow (rare)

First check

Verify Sync mode enabled

Test point: Mode display
Expected: Sync mode active (not Remote Sync)

2 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Sync marker absent or inconsistent with QRS waveform patient safety

Synchronization marker not appearing or not aligned with QRS complex on display and recorder

Ranked causes

1. Device not in Sync mode (common)
2. Device in Remote Sync mode when Sync mode intended (occasional)
3. Suboptimal ECG lead selection (common)
4. Poor electrode contact or placement (common)
5. Recorder paper too narrow (rare)

First check

Verify Sync mode is selected

Test point: Mode selector or display
Expected: SYNC mode displayed; Sync marker visible on QRS

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unable to deliver SHOCK in Sync mode high voltage

Cannot deliver energy to patient while in Sync (synchronous cardioversion) mode

Ranked causes

1. SYNC selection not displayed (common)
2. No ECG signal displayed (common)
3. Sync markers not present on QRS (common)
4. Wrong electrode placement (common)
5. SHOCK button not held long enough (common)

First check

Verify SYNC mode is active

Test point: Monitor display
Expected: SYNC XXXJ SEL displayed

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unable to SHOCK when in Sync mode high voltage

Defibrillator will not deliver synchronized shock despite Sync mode active

Ranked causes

1. No SYNC XXXJ SEL display indicating sync not ready (common)
2. No ECG signals displayed (common)
3. No Sync markers (arrows) above R waves (common)
4. SHOCK button not held down long enough (occasional)
5. Suboptimal electrode placement (occasional)

First check

Verify SYNC XXXJ SEL displayed

Test point: Monitor display status line
Expected: SYNC XXXJ SEL visible on display

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery indicator alternating green and yellow

Battery status indicator light cycles between green and yellow colors

Ranked causes

1. Battery not installed or properly seated (common)
2. Battery fault condition detected (common)
3. Battery depleted or defective (common)
4. Charger or charging system fault (occasional)

First check

Verify battery is installed

Test point: Battery compartment
Expected: Battery pack properly installed and seated

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CHECK PADS message displayed patient safety

Message indicates therapy electrode connection or integrity problem

Ranked causes

1. Therapy electrode not connected to OneStep cable (common)
2. Electrode gel is dry (common)
3. Electrode-to-patient contact is poor (common)
4. OneStep cable is defective (occasional)

First check

Verify electrode to OneStep cable connection

Test point: Therapy electrode connector to OneStep cable
Expected: Firm connection between electrode and cable

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CHECK PADS message for pacing patient safety

Unit displays CHECK PADS message when pacing mode is selected

Ranked causes

1. Therapy electrodes not connected to OneStep cable (common)
2. Electrode gel dried out or aged beyond specification (common)
3. Poor electrode-to-patient contact (common)
4. Defective OneStep cable (occasional)

First check

Verify therapy electrode connection to OneStep cable

Test point: OneStep cable connector to electrodes
Expected: Electrodes firmly connected to cable

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CHECK PADS or ATTACH PADS message patient safety

Message indicating hands-free therapy electrode connection problem

Ranked causes

1. Pads not properly connected or seated (common)
2. Electrode contact or gel condition poor (common)
3. OneStep cable is defective (occasional)
4. Pad/electrode set is defective (occasional)

First check

Disconnect and reconnect OneStep cable

Test point: OneStep cable connection
Expected: Cable firmly seated on both electrodes and device

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG LEAD OFF message displayed patient safety

Unit displays message indicating ECG cable or electrodes are not connected or making contact

Ranked causes

1. ECG cable or electrodes not connected or making poor contact (common)
2. Dried out or degraded electrodes (common)
3. Cable change requiring reset (occasional)
4. Defective cable (occasional)

First check

Verify ECG cable and electrode connections

Test point: Cable connectors and patient electrode pads
Expected: Cable firmly connected to unit and patient, electrodes in contact with skin

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

LOW BATTERY message appears with AC power connected

LOW BATTERY message displayed even though unit is plugged into AC mains

Ranked causes

1. AC Power Indicator not illuminated (common)
2. Battery depleted or defective (common)
3. Charger connection intermittent (occasional)
4. AC mains not functional (occasional)

First check

Verify AC Power Indicator illuminated

Test point: AC Power Indicator light
Expected: AC Power Indicator lit

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No 30J TEST OK message during manual defibrillator self-test high voltage

Defibrillator self-test at 30 joules fails to display TEST OK message

Ranked causes

1. Device not set to 30 joules (common)
2. OneStep electrode not properly connected or package sealed (common)
3. Test Port connector not firmly inserted (occasional)
4. Paddles not firmly pressed during paddle test (occasional)

First check

Verify device set to 30 joules

Test point: Energy selector display
Expected: 30 joules displayed

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No apparent energy delivery to patient high voltage

No visible patient reaction when defibrillator shock is delivered, or energy delivery uncertain

Ranked causes

1. Some patients will not show physical reaction to energy (common)
2. Device malfunction or insufficient energy output (occasional)
3. Poor pad contact or CHECK PADS message (common)
4. Poor pad placement or adhesion with hands-free pads (occasional)

First check

Review discharge stripchart for energy confirmation

Test point: Stripchart printout showing Joules delivered
Expected: Energy delivery recorded (e.g., 200J delivered)

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

POOR LEAD CONTACT message displayed patient safety

Unit indicates ECG electrodes or pacing cable not making adequate contact with patient

Ranked causes

1. Electrode or cable not connected or making poor skin contact (common)
2. Dried out or degraded electrodes (common)
3. Cable type change requiring reset (occasional)
4. Defective cable (occasional)

First check

Verify cable and electrode connections

Test point: Cable connectors and electrode pads
Expected: Cable firmly connected, electrodes in good contact with patient skin

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Standby pacing patient gets paced intermittently patient safety

Patient on standby pacing mode is being paced sporadically instead of continuously when needed

Ranked causes

1. ECG lead connection or placement problem (common)
2. ECG cable damaged (occasional)
3. Patient's R-to-R interval varying (common)
4. Pacing rate not set appropriately (common)

First check

Verify ECG/pacing cable connection

Test point: Cable connectors
Expected: Cable firmly seated and connected

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unable to deliver SHOCK in Remote Sync mode high voltage

Cannot deliver energy to patient while in Remote Sync (external synchronization) mode

Ranked causes

1. REMOTE SYNC not properly displayed (common)
2. Remote device not properly connected (common)
3. Remote device not sending proper Sync markers (common)
4. SHOCK button not held long enough (common)

First check

Verify REMOTE SYNC mode active

Test point: Monitor display
Expected: REMOTE SYNC shown in place of ECG; REMOTE SYNC XXXJ SEL displayed

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unable to SHOCK when in Remote Sync mode high voltage

Defibrillator will not deliver energy in Remote Sync mode despite remote device connected

Ranked causes

1. REMOTE SYNC not displayed or not set up (common)
2. Remote device not properly connected or not conforming to specs (occasional)
3. Sync markers not present or not synchronized with R waves on remote (occasional)
4. SHOCK button not held down properly (occasional)

First check

Verify REMOTE SYNC displayed

Test point: Device display status
Expected: REMOTE SYNC shown and REMOTE SYNC XXXJ SEL visible

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery indicator alternately illuminating green and yellow patient safety

Battery status indicator shows alternating green and yellow lights indicating abnormal charging state

Ranked causes

1. Battery pack not installed or not recognized (common)
2. Battery pack discharged or defective (common)
3. Charging circuit malfunction (occasional)

First check

Verify battery pack installed

Test point: Battery compartment
Expected: Battery pack present and properly seated

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery LED not showing proper status caution

Battery LED is flashing or not displaying solid green or amber, indicating battery fault or seating issue

Ranked causes

1. Battery not properly seated in well (common)
2. Battery displaying fault indicator (occasional)
3. Damaged or dirty battery pins and contacts (occasional)

First check

Check battery LED status

Test point: Battery LED on unit
Expected: Solid green or solid amber LED

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Impedance after board replacement patient safety

After replacing digital board, analog board, or PD engine, impedance calibration is required to ensure proper defibrillation delivery

Ranked causes

1. Digital board replaced (unknown)
2. Analog board replaced (unknown)
3. PD engine replaced (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

CHECK RECORDER message displayed

Unit displays message indicating recorder malfunction or paper issue

Ranked causes

1. Recorder out of paper (common)
2. Recorder door open (common)
3. Paper loaded upside down or incorrectly (occasional)

First check

Check paper level in recorder

Test point: Recorder paper cartridge or tray
Expected: Paper present and not empty

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code Readiness indicator shows red X when unit is powered on patient safety

Red X displayed on Code Readiness indicator while defibrillator is running

Ranked causes

1. Code readiness fault during operation (common)
2. Defibrillator self-test failure (occasional)
3. Persistent code readiness fault (rare)

First check

Power cycle unit

Test point: Power control
Expected: Unit powers off and back on

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Defibrillation charging or delivery not working patient safety

CHARGE button does not charge unit to selected energy; SHOCK button does not deliver energy; energy selection not incrementing correctly

Ranked causes

1. Energy selection circuit malfunction (occasional)
2. Charge circuit malfunction (occasional)
3. SHOCK button not making contact or delivery circuit failure (rare)

First check

Test energy selection decrements correctly

Test point: Display energy value and ENERGY SELECT buttons
Expected: Energy decrements from selected value to 1J when down arrow held; increments sequentially when up arrow pressed

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Light or poor quality printing

Recorded output is too faint or print quality is degraded

Ranked causes

1. Wrong paper type installed (common)
2. Paper installed backwards (common)
3. Recorder print head requires cleaning (occasional)

First check

Verify paper type

Test point: Recorder paper
Expected: Correct manufacturer-approved paper type

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Light or poor quality printing from recorder

Recorder output is faint or low contrast; printout is difficult to read

Ranked causes

1. Incorrect or deteriorated paper type (common)
2. Paper installed upside down (common)
3. Print head requires cleaning (occasional)

First check

Verify correct paper type installed

Test point: Paper specification and packaging
Expected: Correct paper type for device installed

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

LOW BATTERY message while plugged into AC mains patient safety

Unit displays low battery warning even though device is connected to AC power

Ranked causes

1. AC Power Indicator not illuminated; AC not connected properly (common)
2. Battery pack discharged or defective (common)
3. AC power cord or wall outlet not working (occasional)

First check

Verify AC Power Indicator illuminated

Test point: AC Power Indicator light
Expected: AC Power Indicator lit (green or appropriate color)

3 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Patient on standby pacing gets paced intermittently patient safety

Device unexpectedly delivers pacing pulses when in standby mode or at inappropriate times

Ranked causes

1. ECG lead wire disconnected causing asynchronous pacing (common)
2. Damaged ECG cable (occasional)
3. Patient R-to-R interval varying close to pacing rate (occasional)

First check

Verify ECG electrode connection and placement

Test point: Electrode pads and cable connectors
Expected: All electrodes firmly connected; good skin contact

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power supply verification after board or supply replacement high voltage

Power supply testing required after replacing digital board, AC power supply, or battery interconnect board to verify proper operation

Ranked causes

1. Digital board replaced (unknown)
2. AC power supply replaced (unknown)
3. Battery interconnect board replaced (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

SpO2 Monitor not displaying reading patient safety

Monitor shows dashed line or no SpO2 value after simulator connection

Ranked causes

1. Simulator not enabled or in wrong mode (common)
2. Cable or sensor connection loose or damaged (common)
3. Display update delay (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not turn on or unexpectedly shuts off patient safety

Defibrillator fails to power on or powers off without user action

Ranked causes

1. Battery pack not properly installed or discharged (common)
2. Unit not connected to AC power (common)
3. Battery pack fully discharged (occasional)

First check

Verify battery pack installation

Test point: Battery compartment
Expected: Battery pack fully inserted and locked

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Wi-Fi card does not transmit Full Disclosure File patient safety

R Series fails to send Full Disclosure File via Wi-Fi; error message displayed or transmission unsuccessful

Ranked causes

1. Wi-Fi card not configured correctly for network connection (common)
2. Wi-Fi access point not available or out of range (occasional)
3. Defective Wi-Fi card (occasional)

First check

Turn R Series to On or Monitor mode

Test point: Device power mode
Expected: Device in On or Monitor mode

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Wi-Fi card fails to transmit device history

Device History transmission to ZOLL server unsuccessful; error message displayed instead of 'Defib History has sent'

Ranked causes

1. Wi-Fi card not configured correctly for network connection (common)
2. Wi-Fi access point unavailable (occasional)
3. Defective Wi-Fi card (occasional)

First check

Verify Wi-Fi card configuration matches intended transmission type

Test point: R Series Print Config menu
Expected: Configuration matches Full Disclosure File, Device History, or both as intended

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery and AC Power indicators not illuminated when plugged in

Neither Battery nor AC Power indicator lights up when device is connected to AC mains

Ranked causes

1. AC power connection problem (common)
2. AC mains not functional (occasional)

First check

Disconnect and reconnect AC power

Test point: AC power connection
Expected: Device unplugged and replugged; indicators illuminate

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code Readiness indicator displays red X while powered on patient safety

Code readiness LED shows red X symbol when defibrillator unit is powered on and running.

Ranked causes

1. Code readiness fault active during operation (unknown)
2. Unit continues to fail after troubleshooting (occasional)

First check

Power cycle unit

Test point: Power switch
Expected: Unit boots up, readiness indicator becomes green or shows status message

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Code Readiness indicator displays red X while unit is on patient safety

Code Readiness indicator shows red X symbol when defibrillator is powered on

Ranked causes

1. Internal fault detected by Code Readiness system (common)
2. Defibrillator output circuit fault (occasional)

First check

Power cycle unit

Test point: Code Readiness indicator
Expected: Indicator clears and unit returns to normal operation

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Defibrillator will not charge high voltage

Defibrillator energy level does not increment on display when charging is initiated

Ranked causes

1. SHOCK button stuck in ON position (common)
2. Battery pack fully discharged (common)

First check

Check SHOCK button is not stuck

Test point: SHOCK button on paddles and front panel
Expected: Button releases properly; not stuck ON

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Heart rate display reads 0 despite pacing capture patient safety

ECG shows paced beats on display but heart rate counter shows 0

Ranked causes

1. Patient actually has no pulse (common)
2. Wrong ECG lead selected (occasional)

First check

Assess patient's actual perfusion status

Test point: Patient pulse and vital signs
Expected: Patient has palpable pulse

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Heart rate display reads 0 with proper pacing capture patient safety

Heart rate monitor shows zero while pacing is functioning and capture beats visible on ECG

Ranked causes

1. Patient cardiac output absent or very weak (common)
2. Suboptimal ECG lead configuration not detecting intrinsic beats (occasional)

First check

Assess patient cardiac status

Test point: Patient pulse and perfusion
Expected: Patient has cardiac output; pacing is functional

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inconsistent QRS beep or heart rate patient safety

QRS detection beep is irregular or heart rate display fluctuates abnormally

Ranked causes

1. Wrong lead selected (common)
2. Suboptimal electrode placement (common)

First check

Change ECG lead

Test point: Lead selector
Expected: QRS beep becomes consistent

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inconsistent QRS beep or heart rate display patient safety

QRS beep sound or heart rate measurement is inconsistent or unreliable

Ranked causes

1. Suboptimal ECG lead selection (common)
2. Poor electrode contact or placement (common)

First check

Change ECG lead selection

Test point: Lead selector
Expected: Consistent QRS beep and stable heart rate display

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Neither Battery nor AC Power indicator illuminated with device plugged in patient safety

Both battery and AC power status indicators are dark even with device connected to wall outlet

Ranked causes

1. AC connection issue or internal fault (common)
2. AC wall outlet or mains power failure (occasional)

First check

Power cycle AC connection

Test point: AC plug and connection
Expected: After disconnecting and reconnecting, indicators illuminate

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No stimulus marker present on ECG trace patient safety

Pacing stimulus marker does not appear on ECG display

Ranked causes

1. Unit not in PACER mode (common)
2. PACER RATE set lower than patient heart rate (common)

First check

Verify PACER mode is active

Test point: Mode indicator
Expected: Unit display shows PACER mode active

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No stimulus marker present on ECG trace during pacing patient safety

Pacing stimulus marker not visible on ECG display during pacing operation

Ranked causes

1. Device not in PACER mode (common)
2. Pacing rate not set above patient heart rate (common)

First check

Verify unit in PACER mode

Test point: Mode selector or display
Expected: PACER mode selected and active

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

NOISY ECG RETRY ANALYSIS message patient safety

Unit displays message indicating ECG signal is too noisy for automatic analysis and user should retry

Ranked causes

1. Poor electrode adhesion or electrode condition (common)
2. Patient or external movement causing artifact (common)

First check

Check electrode application and adhesion

Test point: Electrode pads on patient skin
Expected: Electrodes properly applied and firmly adhered

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pads expired or need replacement patient safety

OneStep electrode expiration date has passed or pad condition is poor

Ranked causes

1. OneStep electrodes expired (common)
2. Electrode gel dried or aged (common)

First check

Inspect pad expiration date

Test point: OneStep electrode package
Expected: Current date is before expiration date

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Plethysmogram waveform not displayed

Monitor does not show plethysmogram waveform during SpO2 monitoring

Ranked causes

1. Sensor not properly positioned or making contact (common)
2. Display issue or configuration error (occasional)

First check

Verify Mode Selector is set to MONITOR

Test point: Mode Selector position
Expected: MONITOR

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Poor ECG signal amplitude with normal calibration

ECG signal is weak or small but calibration pulse is normal

Ranked causes

1. Wrong ECG lead selected (common)
2. Suboptimal electrode placement (common)

First check

Try alternate ECG lead

Test point: Lead selection
Expected: Signal amplitude increases

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Poor ECG signal amplitude with normal calibration pulse

ECG trace shows low amplitude signal although calibration pulse appears normal

Ranked causes

1. Suboptimal ECG lead selection for patient cardiac signal (common)
2. Poor electrode contact or placement (common)

First check

Select alternate ECG lead

Test point: Lead selection control
Expected: ECG signal amplitude increases

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power LED status incorrect caution

AC Power LED not illuminated when AC connected; Battery LED not showing correct charge state

Ranked causes

1. AC power supply failure or LED failure (occasional)
2. Battery not present or charging fault (common)

First check

Verify AC Power LED when AC connected and unit off

Test point: AC Power LED
Expected: Illuminated (steady)

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pulse rate discrepancy patient safety

Displayed pulse rate does not match manually measured pulse

Ranked causes

1. Sensor motion or poor contact (common)
2. Sensor placement on different finger or hand (occasional)

First check

Measure operator pulse manually

Test point: Radial or carotid artery
Expected: Stable pulse rate in beats per minute

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SELECT PADS message displayed patient safety

Unit displays message indicating hands-free pads must be attached for automatic analysis mode

Ranked causes

1. ECG analysis requires hands-free electrodes in Advisory mode (common)
2. Manual mode with paddles selected (occasional)

First check

Attach hands-free therapy electrodes if Advisory mode needed

Test point: Therapy electrode connectors
Expected: Hands-free electrodes connected and ready for ECG analysis

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SET CLOCK message displayed

Time and date information message appears on monitor

Ranked causes

1. Time and date need to be set (common)
2. Internal lithium battery needs replacement (occasional)

First check

Set clock date and time

Test point: Clock setting interface
Expected: Current date and time entered

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SpO2 sensor not detected patient safety

Unit displays 'CHECK SPO2 SENSOR' message and emits two beeps when sensor is removed or patient cable is unplugged

Ranked causes

1. SpO2 sensor disconnected from finger (common)
2. Patient cable unplugged from unit (common)

First check

Verify SpO2 sensor is attached to finger

Test point: Sensor contact with patient finger
Expected: Sensor firmly attached to finger

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More symptoms

Strip chart recording incorrect or missing data
Alarm suspend function not working
Alarm tone sounds when unit powered on but alarm not enabled
Bedside monitor ECG becomes erratic during pacing
Bedside/Central Station/Telemetry ECG display erratic during pacing
Calibration: Charge time verification at 200J
Calibration: NIBP transducer
Calibration: Power Supply Test
Calibration: Print output
Calibration: Shock energy delivery
Calibration: SpO2 Monitor
Charge time to 200 J exceeds 10 seconds
CHECK CPR PUCK message displayed
CHECK PADS alarm displays when pacing
Code Readiness indicator displays red X while unit off
Code Readiness indicator shows red X when unit is off
CPR Remaining Timer enabled but fails to decrement
DEFIB MAINT. REQ. message displayed
Defibrillator discharge test failure
Defibrillator does not discharge at pads
Defibrillator does not display ready state at 30J
ECG lead off alarm not triggered
ECG LEAD OFF detection not functioning on all leads
ECG LEAD OFF message does not display when lead disconnected
ECG lead selection not working
ECG signal not displaying
ECG waveform size not adjusting
Full preventive maintenance after any component replacement
Heart rate alarm not sounding on lead disconnect
Heart rate outside expected range
Internal discharge does not occur
LOW BATTERY message does not display at low threshold
No ECG trace or dashed line displayed
No ECG trace or dashed line on display
Pace stimulus marker spacing incorrect on recorder output
Pace stimulus markers not displayed on ECG
Pacer output amplitude out of specification
Pacer output not detected
Pacer output verification during preventive maintenance
Pacer pulse width out of specification
Pacer rate inaccurate
Persistent Red X in RFU window
Recorder makes stuttering sound when activated
Remote ECG signal input test
Remote synchronization cardioversion test
REPLACE BATTERY message does not display at critical voltage
SELECT 30J FOR TEST displayed
SELECT ASYNC PACE displayed
SELECT DEFIB MODE displayed
SELECT LIMB LEADS displayed
SELECT PADS ECG displayed
SET CLOCK displayed
SET PACE MA displayed
SHOCK ADVISED displayed
SpO2 alarm functionality verification
SPO2 AMBIENT LIGHT displayed
SPO2 COMM ERROR displayed
SPO2 PULSE SEARCH displayed
STAND CLEAR displayed
Strip chart paper not advancing
Summary Report will not print
Summary Report will not print when Report/Print Chart activated
SUMMARY TIMEOUT displayed
SYNC DEFIB DISABLED displayed
System current consumption exceeds specification
SYSTEM FAULT 210 displayed
SYSTEM FAULT 211 displayed
SYSTEM FAULT 212 displayed (Pace)
SYSTEM FAULT 212 displayed (User Interface)
SYSTEM FAULT 214 displayed
SYSTEM FAULT 215 displayed
SYSTEM FAULT 36 displayed
SYSTEM FAULT 37 displayed
SYSTEM FAULT 38 displayed
TEST FAILED 30J displayed
TRANSFERRING DATA displayed
Unit does not charge to specified energy level
Unit does not power on
Unit does not turn on at minimum voltage
Unit does not turn on at nominal voltage
Unit off-mode current consumption exceeds specification
USE PADDLE DISCHG displayed
USE PADS TO PACE displayed
USER SETUP REQ. displayed
VF ALARMS OFF displayed
X FAULT XX message displayed
ZERO CO2 ADAPTER displayed
ZERO DONE displayed
ZERO FAILED displayed
ZEROING CO2 ADAPTER displayed

90 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`200J MAX BIPHASIC`	User attempted to set defibrillation energy above 200J on biphasic unit	User input requesting energy level greater than 200J on biphasic defibrillator	info
`30 J TEST OK`	30J defibrillator self-test passed	Unit successfully completed 30J defib self-test	info
`30 J TEST OK`	Unit successfully passed 30J defibrillation self-test	Completion of 30J self-test procedure	info
`30J TEST OK`	Defibrillator successfully discharged 30J energy with measured parameters within specification	SHOCK button held after unit reached DEFIB 30J READY state	info
`50 J MAX`	Energy setting limited to 50J maximum for internal paddles	User input requesting energy level greater than 50J with internal paddles	info
`50 J MAX`	Internal paddle defibrillation energy limited to 50J maximum	User attempts to set energy <50J for internal paddles	info
`ALARM SET`	Status message indicating alarm configuration in progress	User selects alarm settings	info
`ALARM SET`	Alarm settings are being configured	User is adjusting alarm parameters on the unit	info
`ANALYSIS HALTED`	ECG analysis stopped during processing	User interaction or charging error during ECG analysis	warning
`ASYNC PACE ONLY`	PD module cannot detect synchronization pulses	System attempting sync paced defibrillation with absent sync pulses	unknown
`ATTACH PADS`	No defibrillation pads attached to patient in AED auto mode	AED power-up without pads	critical
`ATTACH PADS`	Therapy pads/electrodes not detected on system startup	AED power-up in Auto Defib mode without pads attached	unknown
`AUDIO QUEUE FULL`	Audio output queue cannot accept additional voice prompts	Multiple voice prompts queued simultaneously	warning
`BATTERY COMMS ERROR`	Battery not communicating with host computer	Initialization or battery status check	error
`BATTERY FAULT`	Battery hardware fault detected	Battery self-test or voltage monitoring	critical
`BATTERY FAULT`	General battery failure detected	Battery self-test or operation	error
`BATTERY ID FAULT`	Battery identification chip failure or mismatch	Battery ID verification during power-up	error
`BATT HIGH CURRENT`	Battery not charged and current draw exceeds 1.6 A	Battery discharge with excessive current	error
`BATT HIGH CURRENT`	Battery charging current exceeds 1.6 A when battery not charged	Charging operation when battery in low state	error
`BATT HIGH VOLTAGE`	Charger output voltage is too high	AC charger or battery monitoring during charge	error
`BATT LOW VOLTAGE`	Charger output voltage is too low	AC charger or battery voltage monitoring	error
`CAL. BARO. PRESSURE`	Barometric pressure sensor reading is out of acceptable range	Barometric pressure measurement during operation	error
`CALIBRATE NIBP`	NIBP (Non-Invasive Blood Pressure) calibration incomplete or failed	NIBP system initialization	unknown
`CANNOT CHARGE`	Defibrillator charging circuit failure	Charge button pressed	critical
`CANNOT CHARGE`	Unit cannot perform charging when charge button pressed	User presses charge button but charging cannot proceed	error
`CF TRANSFER FAILED`	CompactFlash data transfer error for Summary/DVCK/ALOG files	Data transfer to or from CompactFlash card	error
`CHANGE LEADS`	Defib Sync mode active with heart rate below 20 BPM	Pacing in Sync mode when heart rate drops below 20 BPM	unknown
`CHARGE FAILED`	Defibrillator failed to reach requested energy level	Charge cycle failure	critical
`CHARGE FAILED`	Requested charge operation did not complete	User initiates charge but charging circuits fail	error
`CHECK CO2 ADAPTER`	CO2 airway adapter removed, occluded, or zeroing performed incorrectly	CO2 monitoring when adapter in abnormal state	unknown
`CHECK CO2 SENSOR`	EtCO2 sensor unplugged or defective	CO2 monitoring initialization or during measurement	unknown
`CHECK CUFF/HOSE`	Blood pressure cuff or hose connection/function problem	NIBP measurement attempt	warning
`CHECK ECG CABLE`	ECG cable identifier chip error or invalid cable	ECG cable connection detection	error
`CHECK ECG CABLE`	Invalid ECG cable ID detected	ECG system initialization	unknown
`CHECK ELECTRODE`	Cannot read electrode ID chip or checksum failed	Electrode verification at system startup	unknown
`CHECK ELECTRODE`	Defibrillation electrode identification or verification failure	Electrode connection detection	error
`CHECK PADS`	Pads have poor contact or short circuit	Impedance measurement or defib delivery preparation	unknown
`CHECK PADS`	Defibrillation pads contact or connection problem	Pad impedance measurement or defib pad detection	critical
`CHECK PADS/POOR PAD CONTACT`	Pad contact detection circuit detected missing or poorly seated pads	Defibrillator selector switched to DEFIB mode with leads set to PADS and no pads detected	warning
`CHECK PATIENT`	Background ECG analysis detects shockable rhythm	Continuous background ECG monitoring	unknown
`CHECK PULSE`	No-shock advised or alternate message configuration	ECG analysis after shock or with auto-analyze enabled	unknown
`CHECK PULSE`	No shock advised based on ECG analysis; check for patient pulse	ECG analysis completion	info
`CHECK RECORDER`	Paper tray empty, paper jam, or recorder door open	Recorder subsystem status check	unknown
`CHECK SPO2 SENSOR`	Invalid SpO2 reading due to sensor or application issue	Inappropriate sensor site, poor application, no patient cable plugged in, or motion artifact	warning
`CHECK SPO2 SENSOR`	SpO2 sensor not detected or disconnected	Sensor removed from finger or patient cable unplugged from unit	warning
`CHECK SPO2 SITE`	Insufficient perfusion at sensor site	Blood flow to sensor location is inadequate for measurement	warning
`CLOCK BATTERY FAULT`	Real-time clock coin battery failure	RTC boot-up or operation	error
`CLOCK FAULT 11`	Real Time Clock oscillator failure	RTC initialization during power-up	critical
`CLOCK FAULT 12`	RTC backup power supply failure; oscillator not running at startup	RTC power-up	error
`CLOCK FAULT 13`	Real Time Clock time unit out of range	RTC data validation at startup	error
`CO2 COMM ERROR`	No or invalid communication from EtCO2 module	EtCO2 module communication attempt	error
`CO2 DEVICE NOT READY`	CO2 in airway adapter when attempting zero operation	User attempts to zero EtCO2 sensor	unknown
`CO2 IN LINE: WAIT`	Adapter zero attempted with CO2 still in adapter	User initiates zero sequence while CO2 present	unknown
`CO2 IN LINE: WAIT`	CO2 detected in adapter during zeroing attempt	Adapter zero attempted with CO2 present	warning
`CO2 MODULE NOT VALID`	Sidestream CO2 sensor connected (not supported)	CO2 module identification during startup	error
`CO2 OUT OF RANGE`	Calculated CO2 value exceeds 150 mmHg	CO2 measurement during breathing	unknown
`CO2 UNIT ERROR`	EtCO2 sensor or module hardware error detected	Sensor/module self-test or operation	error
`CO2 WARM UP`	Mainstream CO2 sensor warming up after connection	CO2 sensor initialization	info
`CPR FAULT 8`	ECG processor not receiving CPR measurement data	CPR compression detection attempt	error
`DATA TRANSFERRED`	Data transfer to external device completed successfully	End of data transfer operation	info
`DEFIB 30J READY`	Defibrillator charged to 30J energy level and ready to discharge	Unit successfully charges after CHARGE button pressed at 30J energy setting	info
`DEFIB DISABLED`	Defibrillation function disabled due to configuration or fault	Defibrillator disable via configuration or simultaneous faults	critical
`DEFIB FAULT 76`	PD Defib module failure during power-on self-test	POST execution	critical
`DEFIB FAULT 77`	PD module defibrillation failure while running	Defibrillation attempt during operation	critical
`DEFIB FAULT 78`	PD Defib functional safety error detected during operation	Defib operation	critical
`DEFIB FAULT 79`	PD module Defib/Pace failure during power-on self-test	POST execution	critical
`DEFIB FAULT 80`	Undefined error received from PD module	Communication with PD module	critical
`DEFIB FAULT 94`	PD module reset 3 times without being requested	PD module watchdog timeout or crash condition	critical
`DEFIB FAULT 95`	PD module not communicating with host processor	Communication timeout	critical
`DEFIB FAULT 96`	PD module reported error on discharge	Defibrillation delivery attempt	critical
`DEFIB MAINT. REQ.`	Defibrillator maintenance required after 5000+ discharges at 200J	Discharge counter reaches 5000 discharges at 200J	warning
`DEFIB NOT CHARGED`	Discharge button pressed but unit not charged	User presses discharge in Defib mode without charge	warning
`DEFIB NOT CHARGED`	Defibrillator not charged when discharge attempted	Discharge button pressed in Defib mode but unit is not charged	warning
`DEFIB OVERUSE`	Unit overheated from excessive shocks	More than 50 shocks delivered in less than 20 minutes	warning
`DEFIB OVERUSE`	More than 50 defibrillator shocks delivered in less than 20 minutes	Shock delivery rate exceeds threshold	warning
`DEFIB PAD SHORT`	Pad impedance indicates short circuit	Measured impedance between high voltage leads of MFC abnormal	critical
`DEFIB PAD SHORT`	Abnormally low impedance measured between high voltage leads	Impedance measurement before/during defibrillation	error
`DEFIB PAD SHORT`	Pad connector short circuit detected during pad presence check	Universal cable connected to test port with unit in DEFIB mode and leads set to PADS	warning
`DISK FORMAT REQ.`	Problem accessing DOC (data) file on storage disk	File access error during data retrieval	error
`DISK FORMAT REQ.`	Disk format error detected	Any problem with DOC file access occurred	error
`DISK FORMAT REQ.`	Error detected during DOC file access operation	Disk file system access during operation	error
`ECG DISABLED`	Persistent critical hardware failure on ECG module	ECG system initialization and diagnostic check	critical
`ECG DISABLED`	ECG monitoring disabled due to hardware failure	Persistent critical hardware failure on ECG module	critical
`ECG FAULT 200`	No ECG applicable software available	ECG software loading during startup	error
`ECG FAULT 3`	ECG processor reset failure	ECG processor initialization	error
`ECG FAULT 4`	Excessive number of missed samples from ECG processor	ECG signal sampling during monitoring	error
`ECG FAULT 5`	ECG processor power-up initialization failure	ECG processor startup	error
`ECG FAULT 6`	ECG processor hardware failure	ECG processor self-test	critical
`ECG FAULT 7`	ECG processor is not responding to commands	Communication with ECG processor	error
`ECG LEAD OFF`	One or more ECG leads disconnected with non-MFE leads selected	ECG input validation during monitoring	unknown
`ECG LEAD OFF`	One or more ECG leads not connected when non-MFE leads selected	Lead connection detection with ECG input	warning
`ECG RA LEAD OFF`	ECG right arm (RA) lead disconnected	ECG lead continuity check	unknown
`ECG TOO LARGE`	Number of large ECG intervals exceeds threshold	ECG signal analysis during monitoring	warning
`ECG TOO LARGE`	Number of ECG intervals exceeding amplitude threshold	ECG analysis	warning
`ECG V LEAD OFF`	ECG precordial (V) lead disconnected	ECG lead continuity check	unknown
`ENABLE ETCO2`	EtCO2 feature not enabled	User attempts to zero EtCO2 sensor while feature disabled	info
`ENABLE ETCO2`	User attempts to zero EtCO2 sensor while feature is disabled	User initiates zero operation for disabled CO2 feature	warning
`ENERGY INCREMENTED`	Defib energy automatically increased	After shock 1 or 2 delivered with auto-escalation configured	info
`ERASING REPORT`	Unit is erasing the selected report data		info
`ERASING REPORT`	Report data erasure in progress	User selected report data to erase	info
`FULL DISCLS STOPPED`	Full disclosure data recording stopped	Full disclosure data exceeds storage capacity (4 hours or 32MB)	warning
`IF NO PULSE`	CPR period message	CPR period specified by AHA protocol reached	info
`IF NO PULSE`	Message displayed upon entered CPR period specified by AHA protocol		info
`INSERT CARD`	No memory card detected	No card detected during manual or semi-automatic modes	error
`INSERT CARD`	No card detected during manual or semi-automatic modes	CF Card not detected	warning
`INT. DUMP OVERLOAD`	Excessive internal discharges in short time	More than 15 internal discharges in 5 minutes	warning
`INVALID GAS TEMP: RETRY`	Operator attempted to set a gas temperature outside the Capnostat's operating range		warning
`LOW BATTERY`	Low battery	Battery charge below operational threshold	warning
`LOW BATTERY`	Battery voltage low	Battery voltage drops below acceptable level	critical
`NIBP ARTIFACT`	Unit is unable to detect systolic, diastolic or mean blood pressure due to excessive motion or vibration	Patient movement or vibration during measurement	warning
`NIBP ARTIFACT`	Blood pressure measurement failed due to motion artifact	Excessive motion or vibration detected during measurement	warning
`NIBP COMM ERR 259`	NIBP communication error - framing/parity/fifo error	Communication framing, parity, or FIFO error detected	error
`NIBP COMM ERR 260`	NIBP communication error - invalid packets	Invalid packets received from NIBP module	error
`NIBP COMM ERR 261`	NIBP device not responding to action request	NIBP device not taking requested action	error
`NIBP COMM ERR 262`	NIBP device no reply to command	No response from NIBP device to command	error
`NIBP COMM ERR 262`	No reply from device	NIBP module not responding	error
`NIBP FAULT 263`	NIBP module fault 90 received	Fault 90 reported by NIBP module	critical
`NIBP FAULT 264`	NIBP module fault 91 received	Fault 91 reported by NIBP module	critical
`NIBP FAULT 265`	NIBP module fault 97 received	Fault 97 reported by NIBP module	critical
`NIBP FAULT 266`	NIBP module fault 98 received	Fault 98 reported by NIBP module	critical
`NIBP FAULT 267`	NIBP module fault 99 received	Fault 99 reported by NIBP module	critical
`NIBP FAULT 268`	NIBP device no response after power up	NIBP module not responding after power-up	critical
`NIBP MEAS ABORTED`	Blood pressure measurement was aborted	Cuff inflation pressure set too high, inflation too fast, unable to find systolic after 180s, defibrillator charging, or user abort	error
`NIBP NOT READY`	NIBP module not ready for measurement	Defibrillator charging or NIBP module performing power-up self-test	info
`NIBP OUT OF RANGE`	Blood pressure reading out of physiological range	Data from NIBP module is out of range	warning
`NIBP OUT OF RANGE`	Data from the NIBP module is out of range	NIBP measurement outside valid range	error
`NIBP SIGNAL WEAK`	Weak or absent oscillometric signal	Weak or no oscillometric signal detected	warning
`NO DATA TO TRANSFER`	Report data transfer error	Summary Report/Device Check/Activity Log data transfer error	error
`NOISY ECG`	Excessive noise in ECG signal	Number of noisy analysis intervals exceeds threshold	warning
`NOISY ECG`	Number of noisy analysis intervals exceeds threshold	Excessive ECG noise during analysis	warning
`NO QRS DETECT`	Unit is in sync mode and heart rate is below 20 BPM or QRS amplitude is too low for proper synchronization	Low heart rate or low ECG amplitude in sync mode	warning
`NO QRS DETECT`	QRS signal not detected	In sync mode with heart rate < 20 BPM or QRS amplitude too low	warning
`NO SHOCK ADV.`	No shock advised message	Analysis finds non-shockable rhythm	info
`NO SHOCK ADV.`	No shock advised. Analysis finds non-shockable rhythm	ECG analysis detects non-shockable rhythm	info
`OPEN AIR DISCHARGE`	Measured Defib Impedance was greater than 1000 ohms and no energy was delivered	Defibrillation attempted with pads not in contact or open circuit	warning
`OPEN AIR DISCHARGE`	Discharge impedance indicates open circuit	Measured defib impedance > 1000 ohms with no energy delivered	critical
`PACER DISABLED`	Pacing function disabled	Pacing disabled simultaneously with other pace faults	error
`PACER FAULT 115`	PD pacing failure during power-on self-test	PD pace failed during POST	critical
`PACER FAULT 117`	PD pacing functional safety failure during operation	PD pace functional safety fault while running	critical
`PACER FAULT 121`	PD pacing failure during operation	PD pace failed while running	critical
`PACER FAULT 122`	PD module Defib/Pace failure during power-on self-test	PD module defib/pace failure during POST	critical
`PACER WARNING 124`	PD pacing warning during operation	PD pace warning while running	warning
`PADDLE FAULT`	Cannot detect paddle type	Cannot detect type of accessory attached to universal cable	error
`PADDLE FAULT`	Cannot detect type of accessory attached to the universal cable	Paddle type detection failure	error
`PEDIATRIC PADS IN USE`	The one of the Pediatric ID is missing	Pediatric identification missing during pediatric mode	warning
`PEDIATRIC PADS IN USE`	Pediatric electrode pads active	One of the Pediatric ID is missing	warning
`PERFORM CPR`	Message displayed upon entered CPR period specified by AHA protocol		info
`PERFORM CPR`	CPR in progress message	CPR period specified by AHA protocol entered	info
`POOR LEAD CONTACT`	ECG lead electrode poor or absent connection	One or more ECG leads poorly connected or not connected to patient	warning
`POOR PAD CONTACT`	Electrode impedance exceeds threshold	Defibrillation pads not adequately coupled to patient skin	warning
`POOR PAD CONTACT`	Defibrillation pad impedance high	Electrode impedance exceeds threshold	warning
`PRESS ANALYZE`	Alternate message for Check Patient message if this configuration option is selected		info
`PRESS CHARGE`	User prompt to charge defibrillator	Discharge button pressed before charge or advisory after SHOCK ADVISED	info
`PRESS CHARGE`	Discharge button pressed in Manual Defib mode but unit is not charged, or advisory message following SHOCK ADVISED	Button pressed when unit not ready or auto-charge disabled	info
`PRESS SHOCK`	Deliver defibrillation prompt	Unit fully charged and ready to deliver shock in AED auto mode	info
`PRESS SHOCK`	Prompt issued in AED auto defib mode when defib is charged and ready		info
`READING LOG DATA`	Summary report printing in progress	User requested log data printout	info
`RECORDER FAULT 142`	Strip chart system error	Printer system malfunction detected	error
`RECORDER FAULT 143`	Printer failed power-up self-test	Strip chart failed echo test during POST	error
`RECORDER FAULT 147`	Printer printhead overheated	Printhead temperature exceeded safe operating limit	error
`RELEASE BUTTONS`	Simultaneous external paddle button presses detected before unit reached full defib charge	Both paddle buttons pressed before ready state	warning
`RELEASE SHOCK`	Discharge switch interference detected	Discharge switch closed when pressing charge button or pressed before ready state	warning
`RELEASE SHOCK`	Discharge switch closed when pressing charge button, or discharge button pressed before defib reached ready state	Discharge button activation during charging	warning
`REMOVE SYNC`	Exit synchronization mode	Analyze button pressed or no heart rate detected in Defib Sync mode	info
`REMOVE SYNC`	Analyze button pressed, or no heart rate detected while in Defib Sync mode	Analyze pressed in sync mode or no HR detected	info
`REPEAT NIBP MEAS`	Blood pressure measurement retry needed	Maximum inflation attempts exceeded or 180-second time limit exceeded	warning
`REPLACE BATTERY`	Battery voltage is less than absolute minimum	Battery voltage critically low	critical
`REPLACE BATTERY`	Battery completely discharged	Battery voltage less than absolute minimum; shutdown imminent	critical
`REPORT FULL`	Summary report memory full	Summary report storage capacity reached	warning
`RETRY ANALYSIS`	Rerun rhythm analysis	Noisy ECG detected during analysis	warning
`RETRY ANALYSIS`	Advisory message in conjunction with noisy ECG	ECG analysis halted due to noise	info
`RPT NO DISK`	Internal disk not formatted	Internal disk not formatted and cannot be formatted	critical
`SELECT 30J FOR TEST`	Self test attempt at energy other than 30J	Attempt to run self test at energy other than 30J	warning
`SELECT 30J FOR TEST`	System requests operator reduce energy level to 30J for safe internal discharge testing	Operator selects 100J energy level and presses CHARGE button	info
`SELECT ASYNC PACE`	PD module cannot detect sync pulses; async pacing required	Continuous sync mode operation when sync pulses unavailable	warning
`SELECT DEFIB MODE`	Analyze button pressed in non-defib mode	Analyze button pressed in pace or monitor mode	warning
`SELECT LIMB LEADS`	Paddles or augmented ECG leads selected when continuous analysis active or started	Lead selection error during analysis	info
`SELECT LIMB LEADS`	Wrong lead type selected during analysis	Paddles or augmented ECG leads selected when continuous analysis active or started	warning
`SELECT PADS`	ECG lead (non-MFE Pads) selected when ANALYZE pressed	Lead type mismatch during analysis	info
`SELECT PADS ECG`	Non-MFE pads selected during analysis	ECG lead (non-MFE Pads) selected when ANALYZE pressed	warning
`SET CLOCK`	Real time clock failure with invalid date or time	RTC detects invalid date/time on power-up or operation	warning
`SET PACE MA`	Multiple copy errors in pace module software or memory	Copy errors on first pace entry or after 10+ minutes in other mode	error
`SHOCK ADVISED`	Analysis finds a shockable rhythm	ECG analysis detects shockable rhythm	info
`SHOCK ADVISED`	Shockable rhythm detected during analysis	Analysis detects VF or VT rhythm	critical
`SPO2 AMBIENT LIGHT`	Excessive ambient light detected	High ambient light at sensor site interfering with SpO2 measurement	warning
`SPO2 COMM ERROR`	No transmissions from SpO2 unit received or communication error	SpO2 module communication failure	error
`SPO2 COMM ERROR`	No communication from SpO2 module	System cannot receive transmissions from SpO2 unit	error
`SPO2 PULSE SEARCH`	Sensor cannot detect a pulse	No pulse signal detected at sensor site during normal operation	warning
`SPO2 PULSE SEARCH`	SpO2 module pulse search in progress	SpO2 module actively searching for patient pulse signal	info
`STAND CLEAR`	Patient rhythm is being analyzed	Analysis started or auto-analysis initiated per rescue protocol	info
`STAND CLEAR`	Patient rhythm analysis in progress; keep clear of patient	Analyze button pressed or automatic analysis started during rescue	warning
`SUMMARY TIMEOUT`	Summary report generation timeout error	System fails to generate or transmit summary report within timeout period	error
`SYNC DEFIB DISABLED`	Sync mode enabled when Analyze pressed in defib mode	Sync mode active when Analyze button pressed during defib operation	warning
`SYSTEM FAULT 210`	ECG control task not activated for 500 ms	Digital board ECG task fails to activate within 500 ms cycle	critical
`SYSTEM FAULT 211`	Defib task not activated for 500 ms	Digital board defib task fails to activate within 500 ms cycle	critical
`SYSTEM FAULT 212`	Pace task not activated for 500 ms; or User Interface task not activated for 500 ms	Digital board task fails to activate within 500 ms cycle	critical
`SYSTEM FAULT 213`	System task have not been activated for 500 ms – User Interface	UI task timeout	critical
`SYSTEM FAULT 214`	Display task not activated for 500 ms	Digital board display task fails to activate within 500 ms cycle	critical
`SYSTEM FAULT 215`	Reserved task not activated for 500 ms (not used)	Digital board reserved task fails to activate within 500 ms cycle	critical
`SYSTEM FAULT 36`	Filtered sum of all supply voltages is out of range	Voltage measurement from filtered sum exceeds acceptable limits	error
`SYSTEM FAULT 37`	1/2 scale reference voltage is out of range	Reference voltage measurement exceeds acceptable tolerance	error
`SYSTEM FAULT 38`	Failure to shutdown after shutdown order written to RTC	System fails to power down when shutdown command is sent to Real Time Clock	critical
`TEST FAILED`	30J defib self-test failed	Self-test procedure executed and detected failure in 30J defibrillation circuit	critical
`TRANSFERRING DATA`	Data transfer in progress (informational)	System initiating or executing data transfer to external device or memory	info
`USE PADDLE DISCHG`	Defibrillator is charged and front-panel discharge button pressed when external paddles or internal spoons with discharge buttons are connected	Discharge button pressed while paddles/spoons connected and unit charged	warning
`USE PADS TO PACE`	MFE accessory other than Pads detected in Pace mode	Non-Pads accessory connected while in Pace mode	warning
`USER SETUP REQ.`	Both copies of configuration data are bad, or software with older configuration version was loaded	Configuration memory corruption or old software version installation	error
`VF ALARMS OFF`	VF alarms disabled in incompatible mode or lead selection	Alarms enabled in Pace Mode or Continuous Analysis with non-standard lead, or Alarm button pressed with Heart Rate alarm disabled	warning
`VF ALARMS OFF`	Alarms enabled in Pace Mode or when Continuous Analysis active or started in manual mode but current lead is not Pads/Lead I/II/III; or Alarm button pressed but Heart Rate alarm is disabled	VF alarm function disabled in incompatible mode or alarm disabled state	warning
`ZERO CO2 ADAPTER`	Negative CO2 detected. May be caused by sensor zeroed with CO2 in airway or optical blockage	CO2 sensor reading below acceptable baseline during measurement	warning
`ZERO CO2 ADAPTER`	Negative CO2 detected during capnography monitoring	CO2 sensor detects negative (impossible) CO2 value	warning
`ZERO DONE`	Sensor/adapter zero operation completed successfully (informational)	CO2 adapter zeroing procedure completes normally	info
`ZERO FAILED`	The zero operation did not complete successfully	Zero calibration procedure failed to complete or detect valid baseline	error
`ZEROING CO2 ADAPTER`	CO2 adapter zeroing procedure in progress (informational)	User initiates CO2 adapter zero or system auto-starts procedure	info

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.