Patient monitors · M Series family

ZOLL M: troubleshooting and error codes

The ServiceForge knowledge base holds 60 documented symptoms for the ZOLL M, with 126 ranked causes, 144 diagnostic checks with test points and expected values, and 310 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Displayed HR not accurate; artifact present.

Heart rate value shown on display does not match actual patient heart rate; visible signal artifact or noise present on screen

Ranked causes

1. ECG cable or electrode movement causing artifact (common)
2. Patient motion during monitoring (common)
3. Radio frequency interference (RFI) (occasional)
4. Poor electrode to patient skin contact (common)
5. Inadequate skin preparation (common)
6. Cable proximity to electrical equipment or RFI sources (occasional)
7. Loose ECG cable connection in unit (occasional)
8. Defective ECG cable (occasional)
9. Electrode contamination or broken snaps (occasional)
10. Intermittent patient cable or connector wiring issue (rare)
11. Defective ECG input connector (rare)
12. Defective ECG connector cable to system board (rare)
13. Defective system board (rare)

First check

Inspect and reposition ECG cables

Test point: Cable routing and electrode connections
Expected: Cables do not pull on electrodes; no excessive swinging observed

13 more checks with pass and fail actions, 13 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CHECK PADS/POOR PAD CONTACT message displays patient safety

Message indicates defibrillator pad contact or connection problem

Ranked causes

1. PADS connector not fully inserted into universal cable (common)
2. Damaged defibrillator pads, wires or connector (common)
3. Dried out or expired defibrillator pads (common)
4. Poor pad contact with patient skin (common)
5. Cable defect or open circuit (occasional)
6. High Voltage Module cable connection faulty (occasional)
7. Defective High Voltage Module (occasional)
8. Defective system board (rare)

First check

Reseat PADS connector

Test point: PADS connector to universal cable
Expected: Connector fully and firmly seated

9 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG LEAD OFF message displays

Message appears on display indicating loss of ECG signal on one or more leads (3, 5, or 12 lead cable)

Ranked causes

1. Dry or expired electrode gel (common)
2. Poor electrode site preparation (common)
3. Leads not attached (common)
4. ECG cable corrosion or broken connector pins (occasional)
5. Intermittent cable connection (occasional)
6. Faulty ECG input connector or pins (occasional)
7. ECG shielding issue on system board (rare)
8. Defective system board (rare)

First check

Verify electrode site preparation

Test point: Patient skin at electrode sites
Expected: Clean skin, lightly abraded, hair clipped if necessary

10 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Flash or arcing under defibrillator pad patient safety

Visible electrical discharge or arcing beneath defibrillator pad during application or use

Ranked causes

1. Use of alcohol or betadine skin preparation (common)
2. Gel droop or leakage from pad (common)
3. Pads not properly coupling to patient skin or cable (common)
4. Dried out gel on defibrillator pad (common)
6. Expired defibrillator pads (occasional)
7. Chest compression applied through pads (occasional)
8. Front pad lifted during patient repositioning (occasional)

First check

Verify skin preparation method

Test point: Patient skin at pad site
Expected: Prepared with non-alcohol, non-betadine agent

8 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Heart rate not accurate (artifact present) patient safety

Displayed heart rate inaccurate due to electrical artifact on ECG waveform; may include muscle noise or cable movement

Ranked causes

1. ECG electrode or cable movement artifact (common)
2. Patient muscle artifact (common)
3. Poor electrode contact (common)
4. Radio frequency interference from nearby equipment (occasional)
5. ECG cable damage or intermittent connection (occasional)

First check

Ensure ECG cables do not pull on electrodes

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

Check pads or poor pad contact patient safety

CHECK PADS/POOR PAD CONTACT message displayed; defibrillator pads not making adequate contact

Ranked causes

1. Poor pad-to-patient contact (common)
2. Poor electrical connection between pads and cable (occasional)
3. Damaged defibrillator pads or cable (occasional)
4. High voltage module or cable failure (occasional)

First check

Connect universal cable to test shorting plug

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

Displayed HR not accurate. No artifact present.

Heart rate value shown on display does not match actual patient heart rate; no visible signal artifact on screen

Ranked causes

1. Wrong lead selected (common)
2. ECG display size issue (common)
3. Electrode placement issue (common)
4. Heart rate not flashing with QRS complex (occasional)

First check

Verify HR flashing synchronously with QRS

Test point: Display: HR value and QRS waveform
Expected: HR indicator flashes once per each QRS complex visible

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

ECG lead off patient safety

ECG LEAD OFF message displayed during patient monitoring; ECG waveform not displayed

Ranked causes

1. Poor electrode contact (common)
2. Dry or expired electrodes (common)
3. ECG cable damage or poor connection (occasional)
4. ECG input connector or system board failure (occasional)

First check

Try to reproduce problem using ECG simulator

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

Electronic interference

ECG waveform displays excessive noise or 50/60 Hz interference pattern

Ranked causes

1. Excessive radio frequency interference from nearby equipment (common)
2. Patient cables in proximity to electrical equipment (common)
3. M Series unit placed near RFI source (occasional)
4. Active RFI sources operating in environment (common)

First check

Identify sources of RFI in environment

Test point: Surrounding electrical equipment and devices
Expected: RFI sources identified

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

CHECK PADS/POOR PAD CONTACT message displayed patient safety

Unit displays CHECK PADS or POOR PAD CONTACT message indicating defibrillator pad contact or connection issue

Ranked causes

1. Poor pad contact or expired pads (common)
2. Cable or High Voltage Module defect (occasional)
3. High Voltage Module or system board failure (rare)

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

Defibrillator pad contact problem patient safety

CHECK PADS/POOR PAD CONTACT message displayed

Ranked causes

1. Poor pad contact or defective pads (common)
2. Defective cable or connector (occasional)
3. High Voltage Module defect (rare)

First check

Test pad cable with shorting plug

Test point: PADS connector
Expected: DEFIB PAD SHORT message displays

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

Displayed heart rate not accurate with artifact present patient safety

Displayed heart rate inaccurate due to ECG artifact from electrode/cable movement or patient motion

Ranked causes

1. ECG artifact from electrode or cable movement (common)
2. Radio frequency interference (occasional)
3. ECG cable or connector wiring intermittent fault (rare)

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

ECG LEAD OFF message displayed patient safety

Unit displays ECG LEAD OFF message for 3, 5, or 12 lead cable indicating loss of ECG signal on one or more leads

Ranked causes

1. Electrode preparation issue (common)
2. ECG cable or connector issue (occasional)
3. System board or internal connection failure (rare)

First check

Verify electrode expiration date and condition

Expected: Electrodes not expired and gel not dry

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

Heart rate display inaccurate with artifact patient safety

Displayed heart rate inaccurate with ECG artifact present

Ranked causes

1. ECG cable movement or patient motion (common)
2. Radio frequency interference (occasional)
3. Poor electrode or cable connection (common)

First check

Ensure ECG cable fits snugly

Test point: ECG cable connector
Expected: Cable seated properly in unit

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

ECG lead disconnection or poor contact patient safety

One or more ECG leads not properly attached to patient

Ranked causes

1. Lead cable disconnection (common)
2. Patient electrode failure or poor skin contact (common)

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

Heart rate not accurate (no artifact) patient safety

Displayed heart rate does not correlate with actual patient cardiac rhythm; no electrical artifact visible on waveform

Ranked causes

1. Lead selection not optimal for this patient (common)
2. Electrode repositioning needed (common)

First check

Verify heart rate flashes with each QRS on display

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

Noisy ECG signal patient safety

Excessive electrical noise in ECG waveform exceeds analysis threshold

Ranked causes

1. Patient movement or muscle artifact (common)
2. Poor lead contact (common)

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

Poor lead contact patient safety

One or more ECG leads poorly connected or not connected to patient

Ranked causes

1. Electrode attachment failure (common)
2. Unit malfunction (rare)

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

Recorder paper or print mechanism failure caution

Strip chart recorder unable to print or experiencing thermal issues

Ranked causes

1. Paper feed or printhead issue (common)
2. Printhead overtemperature (occasional)

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

V leads off patient safety

V LEADS OFF message displayed on monitor; V lead waveforms not displayed

Ranked causes

1. V lead terminator plug not attached (common)
2. V1 lead touching patient skin (occasional)

First check

Verify V lead terminator is attached

Test point: V lead connector
Expected: terminator plug in place

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

V LEADS OFF message displayed patient safety

Unit displays V LEADS OFF message indicating V lead detection failure, possibly from V1 lead wire contact with patient skin

Ranked causes

1. V lead terminator not connected when not in use (common)
2. V1 lead wire metal snap contact with skin (occasional)

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

V LEADS OFF message displays

Message appears indicating loss of V lead signal

Ranked causes

1. V lead terminator plug not attached when V leads not in use (common)
2. V1 lead wire metal snap in contact with patient skin (occasional)

First check

Verify V lead terminator plug attachment

Test point: V lead connector
Expected: Terminator plug attached when V leads not in use

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

A/D converter timing failure caution

Analog-to-digital converter not performing conversions in timely manner

Ranked causes

1. A/D converter failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Alarm suspend function does not work

Alarm suspend button does not mute alarm tone or suspend alarm for specified duration

Ranked causes

1. Alarm suspend button not functioning (rare)

First check

Press ALARM SUSPEND button during active alarm

Test point: ALARM SUSPEND button
Expected: Alarm tone stops, alarm symbol displays with X through it, heart symbol continues flashing

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

Chest lead disconnection (V1-V6) patient safety

One or more chest leads (V1 through V6) not properly attached

Ranked causes

1. Chest lead cable disconnection (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Displayed heart rate not accurate without artifact patient safety

Displayed heart rate does not match actual patient heart rate with clean ECG waveform showing no artifact

Ranked causes

1. Display filter or size settings inappropriate (common)

First check

Verify heart rate flashes with each QRS on display

Expected: Heart rate indicator synchronizes with QRS complex

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG LEAD OFF alarm does not trigger patient safety

No lead-off alarm tone or visual indication when ECG lead is disconnected from analyzer

Ranked causes

1. ECG lead disconnected or loose connection (common)

First check

Remove ECG lead from analyzer and observe alarm response

Test point: QED 6 Analyzer ECG input
Expected: Alarm symbol flashes, heart symbol stops flashing, ECG LEAD OFF alarm tone sounds

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

ECG processor communication failure caution

Communication lost between ECG processor and main processor

Ranked causes

1. ECG processor fault or communication failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG signal too large patient safety

ECG signal amplitude exceeds expected range for accurate rhythm analysis

Ranked causes

1. High amplitude ECG signal (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

ECG signal too small patient safety

ECG signal amplitude too low for accurate rhythm analysis

Ranked causes

1. Low amplitude ECG signal (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Electronic interference detected caution

System detects excessive radio frequency interference affecting measurements

Ranked causes

1. Nearby RFI source (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

EtCO2 communication error caution

No or invalid communication from EtCO2 module

Ranked causes

1. Module disconnection or failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

EtCO2 sensor warming up

EtCO2 sensor requires extended warm-up period

Ranked causes

1. Sensor cable defect (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Heart rate alarm does not function patient safety

Alarm does not sound when heart rate exceeds threshold; alarm symbol and tone absent during high heart rate condition

Ranked causes

1. Alarm not enabled in monitor menu (common)

First check

Verify alarm state is set to ENABLE

Test point: ECG HR alarm menu
Expected: ENABLE appears on display

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

Heart rate display inaccurate without artifact patient safety

Displayed heart rate does not match actual QRS rate, no artifact visible

Ranked causes

1. Suboptimal lead selection or electrode placement (common)

First check

Verify HR matches QRS

Test point: ECG display
Expected: Heart rate flashes with each QRS on display

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

High voltage capacitor requires discharge before removal high voltage

Unit contains lethal voltages in the high voltage capacitor assembly that must be safely discharged prior to service work

Ranked causes

1. High voltage capacitor charged during normal operation (common)

First check

Open high voltage capacitor plastic isolator

Test point: Capacitor assembly isolator cover
Expected: Mylar tape lifted to expose capacitor

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

IBP monitor zeroing and measurement accuracy verification

Verification procedure to ensure proper pressure channel zeroing and accurate blood pressure measurements on M Series CCT unit with IBP option.

Ranked causes

1. Inaccurate IBP channel calibration or zeroing (unknown)

First check

Set up M Series CCT unit with IBP option and fully charged battery

Test point: M Series unit
Expected: Unit ready for testing

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

IBP noise level verification

Verify absence of excessive noise in blood pressure circuitry using patient simulator and oscilloscope

Ranked causes

1. Routine maintenance to ensure signal quality of IBP channels (common)

First check

Power on M Series CCT unit with battery

Test point: Unit power state
Expected: Unit powers on and displays ready

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

IBP noise test

Verification procedure to ensure there is no excessive noise in the blood pressure circuitry on M Series CCT unit.

Ranked causes

1. Excessive noise in blood pressure circuitry (unknown)

First check

Set up M Series CCT unit with IBP option and fully charged battery

Test point: M Series unit
Expected: Unit ready for testing

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

IBP pressure reading accuracy verification

Verify that blood pressure measurements are accurate and channel zeroing functions properly using patient simulator

Ranked causes

1. Need periodic accuracy verification of IBP channels (common)

First check

Power on M Series CCT unit with fully-charged battery

Test point: Unit power state
Expected: Unit powers on

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

IBP static pressure measurement accuracy

Verify accurate measurement of both positive and negative static pressure values using transducer simulator

Ranked causes

1. Need verification of static pressure calibration accuracy (common)

First check

Power on M Series CCT unit with battery

Test point: Unit power state
Expected: Unit powers on and ready

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

IBP static pressure test

Verification procedure to ensure accuracy of both positive and negative static pressure measurements on M Series CCT unit IBP channels.

Ranked causes

1. Inaccurate static pressure measurement calibration (unknown)

First check

Set up M Series CCT unit with IBP option and fully charged battery

Test point: M Series unit
Expected: Unit ready for testing

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low battery voltage caution

Battery voltage below operating minimum

Ranked causes

1. Battery depletion (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Maintenance schedule verification

Confirm NIBP maintenance procedures completed per schedule: Monitor Test every 6 months, Volume Leak Test annually or per 10,000 readings, Transducer Calibration annually or per 10,000 readings

Ranked causes

1. Maintenance procedures not performed on schedule (occasional)

First check

Verify NIBP Monitor Test completed within 6 months

Test point: Maintenance file and checklist records
Expected: Pass/Fail marked on checklist within last 6 months

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

Maintenance test setup and checklist documentation

Preparation and documentation procedures for conducting quarterly IBP maintenance tests on M Series CCT unit.

Ranked causes

1. Need for periodic IBP function verification (common)

First check

Refer to Operator's Shift Checklist for routine verification

Test point: Operator documentation
Expected: Shift checklist completed at beginning of each shift

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

NIBP Monitor Test verification patient safety

Verifies accuracy of systolic, diastolic, mean blood pressure measurements and pulse rate calculation using Bio-Tek BP Pump NIBP Monitor Analyzer simulator

Ranked causes

1. Transducers or measurement system out of calibration (common)

First check

Connect NIBP Analyzer simulator hose to NIBP connector

Test point: NIBP connector on M Series unit
Expected: Hose firmly connected

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

NIBP Transducer Calibration patient safety

Two-point calibration procedure to ensure accurate pressure measurements; optional at 6 months, recommended annually or every 10,000 readings

Ranked causes

1. Transducer calibration drift from factory settings (occasional)

First check

Connect analyzer simulator hose and configure for pressure simulation

Test point: NIBP connector and analyzer MODE/SELECT buttons
Expected: Analyzer in Pressure Simulator mode, hose connected

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

No QRS detection in sync mode patient safety

Unit cannot detect heart rate or QRS complex in synchronization mode

Ranked causes

1. Low heart rate or signal amplitude (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Open air discharge high voltage

Defibrillation capacitor voltage remains high after discharge attempt

Ranked causes

1. Failed discharge (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pacer circuit failure (multiple types) high voltage

Pacing circuit unable to deliver therapy or verify output

Ranked causes

1. High voltage module failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Poor electrode pad contact patient safety

Defibrillation pad impedance exceeds acceptable threshold

Ranked causes

1. Pad coupling failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Real time clock failure

Unit real time clock contains invalid date or time

Ranked causes

1. Clock data corruption (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Self test failure high voltage

30J self test failed during defib peak current measurement

Ranked causes

1. Defib circuit component failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

SpO2 ambient light interference

Ambient light too bright for SpO2 sensor operation

Ranked causes

1. Excessive ambient light (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

SpO2 communication error caution

No communication from SpO2 measurement module

Ranked causes

1. SpO2 module disconnection or failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

SpO2 sensor fault

SpO2 sensor is defective or unrecognized

Ranked causes

1. Sensor failure or incompatibility (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

System fault caution

Processor or memory integrity error detected

Ranked causes

1. ROM or RAM failure (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Temperature measurement accuracy verification

Verify that temperature channels T1 and T2 on M Series CCT unit with Temperature option display accurate readings when tested with calibrated probe simulator

Ranked causes

1. Temperature sensor or channel calibration drift requiring verification (unknown)

First check

Set Temperature Probe Simulator to room temperature (~68°F)

Test point: T1 channel display
Expected: 67.9 °F

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

Test setup for IBP maintenance procedures

Prepare M Series CCT unit with proper configurations for IBP testing

Ranked causes

1. Initial setup required before performing any IBP maintenance test (common)

First check

Power on M Series CCT unit

Test point: Unit power state
Expected: Unit displays boot screen and main menu

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Wandering baseline

ECG baseline drifts or moves slowly across display instead of remaining stable

Ranked causes

1. Electrode placement or contact issues (90% of cases) (common)

First check

Inspect electrode sites and contact

Test point: Electrode placement and skin contact
Expected: Electrodes in firm full-surface contact with clean skin

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

Error codes

Code	Meaning	Trigger	Severity
`200J MAX BIPHASIC`	User attempted to set defibrillation energy exceeding 200J on biphasic unit	User attempts to select energy level above 200J during defibrillation	info
`50J MAX`	Selected energy below minimum for internal paddles	User attempts to set energy below 50J with internal paddles	info
`ADJUST ECG`	Unit unable to synchronize on detected heart rate	Sync mode active with heart rate below 20 BPM or QRS size set too small	warning
`ANALYSIS HALTED`	ECG analysis halted due to user interaction such as lead/size change, analyze button pressed again, impedance fault, or charging error detected in auto defib mode.	User interaction interrupted analysis or charging error occurred	info
`ANALYSIS HALTED`	ECG analysis interrupted and stopped	User interaction during analysis; lead change; size change; analyze button pressed; impedance fault; charging error	info
`ANALYSIS RESTARTED`	ECG analysis restarted after automatic size adjustment	ECG signal detected out of range; automatic adjustment completed	info
`ANALYSIS RESTARTED`	Device detected ECG signals out of range, automatically adjusted ECG size and is restarting its shockable rhythm analysis sequence.	ECG signal out of range (too large or too small)	info
`AUDIO FAULT 136`	Audio DSP hardware failure	Audio digital signal processor hardware malfunction at power-up or during operation	error
`AUDIO NOT RECORDING`	Audio recording system not functional	Audio recording attempted but system non-functional	warning
`AUDIO QUEUE FULL`	Audio output queue buffer full; cannot accept additional voice prompts	Voice prompt queue reaches capacity during operation	info
`AUDIO QUEUE FULL`	Audio output queue is full. Additional voice prompts can't be queued at this time.	Too many audio prompts queued	info
`BAD CARD`	Cannot read from card	When reading from memory card during configuration	error
`BATT HIGH CURRENT`	Battery is charged and battery current is >.1 A or: Battery is not charged and battery current is > 1.6 A.	Battery current exceeds limits	error
`BATT HIGH CURRENT`	Battery current exceeds safe operating limits	Charged battery current >0.1A or uncharged battery current >1.6A	error
`BATT HIGH VOLTAGE`	Battery voltage exceeds safe operating level	Battery voltage measures above 15.5 volts	error
`BATT LOW CURRENT`	Battery is not charged and battery current is <.35 A.	Battery current drops below minimum	error
`BATT LOW CURRENT`	Battery charging current below minimum acceptable level	Uncharged battery with charging current below 0.35A	error
`BATT LOW VOLTAGE`	Battery voltage below minimum safe operating level	Battery voltage measures below 9.5 volts	critical
`BATT OVERCHARGE`	Charger on for > 4 hours.	Battery charged for extended period	warning
`BATT OVERCHARGE`	Battery charger has been on longer than maximum safe duration	Charger on for more than 4 hours continuously	error
`BATT OVERCHARGE`	Battery charging exceeded safe limits	Charging circuit malfunction or charger fault	error
`BATT OVERCHARGE`	Battery overcharge condition detected	Charging system malfunction or battery fault	warning
`BRIDGE SHORT`	Biphasic bridge circuit showing higher than expected current	During biphasic bridge test or immediately after discharge	error
`BRIDGE SHORT`	Current higher than expected was detected during Biphasic bridge test or immediately following a discharge.	Excessive current during bridge test or discharge	error
`BRIDGE TEST FAILED`	Biphasic module not operating properly while charging.	Biphasic module fails charging test	error
`BRIDGE TEST FAILED`	Defibrillator output stage bridge test failed	During self-test or defibrillation initialization	error
`CABLE FAULT`	ECG or patient cable connection fault detected	Intermittent or broken cable detected during monitoring	warning
`CABLE FAULT`	Cable integrity failure	Cable continuity or insulation test failure	error
`CABLE FAULT`	Incorrect or invalid paddle identification signal on cable	Auto defib mode; paddle ID analog-to-digital reading invalid	error
`CANNOT CHARGE`	Defibrillator capacitor will not charge when charge button pressed	Charge button activated but capacitor voltage does not rise	critical
`CANNOT CHARGE`	Unit unable to charge	Charging operation initiated but charging circuit failure detected	error
`CANNOT CHARGE`	Battery charging not possible	Charger unable to initiate or maintain charging	error
`CANNOT CHARGE`	Charger unable to initiate or maintain charging	When charger is connected and charging button pressed	error
`CANNOT CHARGE 45`	System unable to charge defibrillator	Charging request initiated	error
`CARD EMPTY`	No data on card	When reading from memory card that contains no configuration data	warning
`CARD FULL`	Memory card storage capacity reached	Memory card filled to capacity during recording	warning
`CARD READ FAILED`	No response from card reader	When reading from memory card during configuration	error
`CHECK CO2 ADAPTER`	Airway adapter is removed, occluded or adapter zeroing needs to be performed or was performed incorrectly.	Adapter missing, blocked, or calibration error	warning
`CHECK CO2 SENSOR`	EtCO2 Sensor is unplugged or defective	Sensor not detected or sensor failure	warning
`CHECK MEMORY CARD`	No memory card detected during manual or semi-automated mode	Manual or semi-automated mode active without memory card installed	warning
`CHECK PADS`	Electrode pads not properly applied or have high impedance	Displayed with POOR PAD CONTACT or DEFIB PAD SHORT	unknown
`CHECK PADS`	Pad contact issue detected with poor contact or short circuit	Poor pad contact or defib pad short detected	warning
`CHECK PADS`	Message displayed in conjunction with POOR PAD CONTACT or DEFIB PAD SHORT	Pad contact or connection fault detected	error
`CHECK PADS/POOR PAD CONTACT`	Defibrillator electrode pads have inadequate contact with patient	Poor pad-to-skin contact, pad damage, expired pads, connector issue	error
`CHECK PATIENT`	Shockable cardiac rhythm detected during background analysis	Background ECG analysis detects VF or pulseless VT	unknown
`CHECK PATIENT`	Background ECG analysis detects shockable rhythm	Shockable rhythm detected during background analysis	warning
`CHECK PULSE`	Alternate message for NO SHOCK ADVISED or message after third shock when auto analyze 3 times enabled	No shockable rhythm detected or third shock delivered	info
`CHECK PULSE`	Alternate message for NO SHOCK ADVISED message. Message also shown after delivering third shock when auto analyze 3 times option is enabled.	Non-shockable rhythm detected	info
`CHECK RECORDER`	Paper tray empty, paper jam detected, or recorder door opened	Recorder self-test detects paper out; mechanical jam; door opened	error
`CHECK RECORDER`	Recorder unit requires inspection or maintenance	Recorder malfunction detected or periodic maintenance due	warning
`CHECK RECORDER`	Recorder module fault detected	Recorder circuit malfunction or component failure	warning
`CHECK RECORDER`	Recorder module malfunction detected	During recording initialization or operation	warning
`CHECK RECORDER 47`	Recorder malfunction detected	Recorder operation attempted	warning
`CHECK SPO2 SENSOR`	Pulse oximetry sensor not optimally positioned	SpO2 sensor dislodged or suboptimal placement	info
`CHECK SPO2 SENSOR`	Reposition SpO2 sensor on patient.	SpO2 sensor signal lost or poor	warning
`CHECK SPO2 SITE`	Pulse oximetry signal absent or insufficient from monitored finger or toe	SpO2 sensor placed on low or no perfusion site	warning
`CLOCK FAULT 11`	Real time clock oscillator failure	Clock oscillator malfunction during power-up or operation	error
`CLOCK FAULT 12`	Real-time clock memory or circuit failure 12	During system startup or time verification	error
`CLOCK FAULT 12`	Real-time clock fault condition 12	Clock circuit or timing synchronization failure	warning
`CLOCK FAULT 12 47`			unknown
`CLOCK FAULT 13`	Clock circuit fault 13	System clock error detected	warning
`CLOCK FAULT 13`	Real-time clock fault condition 13	Clock circuit or timing synchronization failure	warning
`CLOCK FAULT 13 47`			unknown
`CO2 COMM ERROR`	No or invalid communication from EtCO2 module	Communication failure between CO2 module and main processor	error
`CO2 SENSOR WARM UP`	EtCO2 sensor currently warming to operational temperature	Sensor powered on; warm-up cycle in progress	info
`CONFIG DATA NOT COMPATIBLE`	Internal software is unable to read card data	When loading configuration from memory card	error
`CONFIRM MANUAL MODE`	System requesting confirmation to enter manual mode	Manual mode activation initiated	info
`CONFIRM MANUAL MODE`	Displayed when manual mode is entered. Alerts user to confirm that manual mode is desired.	Manual mode selected	info
`CONFIRM MANUAL MODE`	Manual mode confirmation required	System entering manual operation mode	info
`CONFIRM MANUAL MODE 47`			unknown
`DEFIB DISABLED`	Defibrillator function disabled	Defibrillator intentionally or unintentionally disabled	warning
`DEFIB DISABLED`	User prompt issued simultaneously with other faults if defib is disabled.	Defibrillation disabled by configuration or fault	error
`DEFIB DISABLED 47`			unknown
`DEFIB FAULT 108`	Defibrillator fault code 108	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 108`	VMON voltage is less than the target energy during charging	Capacitor voltage monitoring shows charging below target	error
`DEFIB FAULT 108 49`			unknown
`DEFIB FAULT 109`	Defibrillator fault code 109	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 109`	Defib capacitor voltage is greater than selected energy when defibrillator is charging or ready.	Capacitor voltage exceeds selected energy level	error
`DEFIB FAULT 109 49`			unknown
`DEFIB FAULT 111`	Defibrillator fault code 111	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 111`	Capacitor voltage exceeded absolute maximum safe voltage	Defib capacitor voltage exceeds absolute maximum acceptable limit	critical
`DEFIB FAULT 111 49`			unknown
`DEFIB FAULT 71`	Defibrillator fault code 71	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 71`	More than 50 internal dumps occurred in less than 20 minutes.	Excessive number of defib energy discharges	error
`DEFIB FAULT 71`	Excessive internal capacitor discharge events	More than 50 internal dump events occur within 20 minutes	critical
`DEFIB FAULT 71 48`			unknown
`DEFIB FAULT 72`	Defibrillator fault code 72	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 72`	General defibrillator malfunction	Unspecified defib system error during operation	critical
`DEFIB FAULT 72 48`			unknown
`DEFIB FAULT 76`	Defibrillator fault code 76	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 76`	Defibrillator capacitor voltage too high for selected energy level	Capacitor charging above target for selected energy	error
`DEFIB FAULT 76 48`			unknown
`DEFIB FAULT 77`	Defibrillator fault code 77	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 77`	Defibrillator capacitor voltage exceeds absolute maximum rating	Capacitor voltage charge exceeds rated maximum safe voltage	critical
`DEFIB FAULT 77 48`			unknown
`DEFIB FAULT 78`	Defibrillation fault 78	Defibrillation energy delivery failure	error
`DEFIB FAULT 78`	Defibrillator fault code 78	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 78 48`			unknown
`DEFIB FAULT 79`	Defibrillator fault code 79	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 79 48`			unknown
`DEFIB FAULT 80`	Defibrillator fault code 80	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 80 48`			unknown
`DEFIB FAULT 81`	Defibrillator fault code 81	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 81`	Discharge switch in undefined or invalid state	Discharge switch state not recognized during operation	critical
`DEFIB FAULT 81 48`			unknown
`DEFIB FAULT 84`	Defibrillator fault code 84	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 84`	Upper discharge transistor shorted (measured via applicable A/D channel).	Upper discharge transistor short circuit	error
`DEFIB FAULT 84 48`			unknown
`DEFIB FAULT 85`	Defibrillator fault code 85	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 85`	Lower discharge transistor shorted (measured via applicable A/D channel).	Lower discharge transistor short circuit	error
`DEFIB FAULT 85 48`			unknown
`DEFIB FAULT 86`	Defibrillator fault code 86	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 86`	One discharge switch closed during power-up self-test	Power-up self-test detects single discharge switch closed	critical
`DEFIB FAULT 86 49`			unknown
`DEFIB FAULT 87`	Defibrillator fault code 87	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 87`	Both discharge switches closed during power up test	Both discharge switches improperly closed at power-up	critical
`DEFIB FAULT 87 49`			unknown
`DEFIB FAULT 94`	Defibrillator fault code 94	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 94`	Processor fault rendering safety monitor port non-functional	Main processor detects safety monitor port failure	critical
`DEFIB FAULT 94 49`			unknown
`DEFIB FAULT 95`	Defibrillator fault code 95	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 95`	Safe or shutdown line not functional	Safety line circuit failure	critical
`DEFIB FAULT 95 49`			unknown
`DEFIB FAULT 96`	Defibrillator fault code 96	High voltage module or defibrillator circuit malfunction	error
`DEFIB FAULT 96`	XPATREL or XPAT_ENABLE is faulted or discharge transistor shorted	Power delivery control circuit failure or transistor short	critical
`DEFIB FAULT 96 49`			unknown
`DEFIB NOT CHARGED`	Defibrillator capacitor not charged to required level	Charging cycle incomplete or capacitor discharge detected	error
`DEFIB NOT CHARGED`	Defibrillator capacitor not charged	Charging circuit failure or charging timeout	error
`DEFIB NOT CHARGED 49`			unknown
`DEFIB PAD SHORT`	Defibrillator pad or cable short circuit detected	Continuity measured between defibrillator output and ground	error
`DEFIB PAD SHORT`	Impedance between high voltage paddle leads measured as short circuit	Measured impedance between HV leads indicates short	unknown
`DEFIB PAD SHORT`	Cable is functioning and connected to pads properly	Normal message when universal cable is connected to shorting test plug	info
`DEFIB PAD SHORT 50`			unknown
`DISABLE SYNC`	Synchronization mode disabled or cannot be enabled	Sync mode disable request or sync circuit malfunction	warning
`DISABLE SYNC`	Sync mode active when analyze pressed during defibrillation	Analyze pressed in defib mode while sync mode enabled	info
`DISABLE SYNC 50`			unknown
`DISCHARGE FAULT`	Defibrillation discharge did not complete properly	After shock delivery attempt	error
`DISCHARGE FAULT`	Defibrillator discharge circuit malfunction	Discharge not detected after defibrillation command	critical
`DISCHARGE FAULT`	Defibrillator capacitor voltage not decreasing after discharge attempt	Discharge commanded but capacitor voltage remains high	critical
`DISCHARGE FAULT 50`			unknown
`ECG FAULT 4`	Communication fault between ECG processor and main processor	Inter-processor communication failure detected	error
`ECG FAULT 5`	ECU RAM test failure or ROM checksum test failure	Memory self-test failure in ECG processing unit	error
`ECG FAULT 5`	ECG circuit or signal processing fault type 5	ECG analog front end or signal path malfunction	error
`ECG FAULT 5`	ECG processing fault 5	During ECG signal processing	error
`ECG FAULT 5 50`			unknown
`ECG LEAD OFF`	ECG lead disconnection detected	One or more ECG leads disconnected or loose	warning
`ECG LEAD OFF`	ECG lead has lost contact with patient or cable is disconnected	Electrode not in contact with patient, cable disconnected, or cable failure	warning
`ECG LEAD OFF`	One or more ECG leads are not properly connected when leads are selected as input.	ECG lead disconnected from patient	warning
`ECG LEAD OFF 50`			unknown
`ECG TOO LARGE`	ECG signal exceeds maximum input range	Excessive ECG signal amplitude detected	warning
`ECG TOO LARGE`	ECG signal amplitude exceeds maximum input range	ECG signal saturation detected	warning
`ECG TOO LARGE`	ECG signal amplitude too large for accurate analysis	QRS complex exceeds upper limit for algorithm	warning
`ECG TOO LARGE 50`			unknown
`ECG TOO SMALL`	ECG signal amplitude too low	ECG signal below acceptable range	warning
`ECG TOO SMALL`	ECG signal amplitude too small for accurate analysis	QRS complex below minimum for algorithm	warning
`ECG V1 LEAD OFF`	Chest lead V1 not properly attached to patient	V1 ECG lead signal absent or not detected	unknown
`ECG V2 LEAD OFF`	Chest lead V2 not properly attached to patient	V2 ECG lead signal absent or not detected	unknown
`ECG V2 LEAD OFF`	ECG V2 precordial lead disconnected or poor contact	V2 lead signal lost or below threshold	warning
`ECG V2 LEAD OFF`	V2 (chest) ECG lead is disconnected or has poor contact	During ECG monitoring	warning
`ECG V2 LEAD OFF 51`			unknown
`ECG V3 LEAD OFF`	V3 (chest) ECG lead is disconnected or has poor contact	During ECG monitoring	warning
`ECG V3 LEAD OFF`	ECG V3 precordial lead disconnected or poor contact	V3 lead signal lost or below threshold	warning
`ECG V3 LEAD OFF`	Chest lead V3 not properly attached to patient	V3 ECG lead signal absent or not detected	unknown
`ECG V3 LEAD OFF 51`			unknown
`ECG V4 LEAD OFF`	ECG V4 precordial lead disconnected or poor contact	V4 lead signal lost or below threshold	warning
`ECG V4 LEAD OFF`	V4 (chest) ECG lead is disconnected or has poor contact	During ECG monitoring	warning
`ECG V4 LEAD OFF`	Chest lead V4 not properly attached to patient	V4 ECG lead signal absent or not detected	unknown
`ECG V4 LEAD OFF 51`			unknown
`ECG V5 LEAD OFF`	Chest lead V5 not properly attached to patient	V5 ECG lead signal absent or not detected	unknown
`ECG V6 LEAD OFF`	Chest lead V6 not properly attached to patient	V6 ECG lead signal absent or not detected	unknown
`ECG V6 LEAD OFF`	ECG V6 precordial lead disconnected or poor contact	V6 lead signal lost or below threshold	warning
`ECG V6 LEAD OFF`	V6 (chest) ECG lead is disconnected or has poor contact	During ECG monitoring	warning
`ECG V6 LEAD OFF 51`			unknown
`ECU CRC FAULT`	ECU data checksum or CRC error detected	Software or firmware data corruption detected	error
`ECU CRC FAULT`	Invalid ECG samples detected over one second period	Cyclic redundancy check failure on ECG data	error
`ECU CRC FAULT 51`			unknown
`ENTER ACCESS CODE`	System requires access code entry for operation	At startup or when accessing service mode	info
`ENTER ACCESS CODE`	System requesting access code or PIN entry	Protected function access attempted	info
`ENTER ACCESS CODE 51`			unknown
`ERASING REPORT`	System erasing stored report data	Report deletion initiated by user or system	info
`ERASING REPORT`	Report or data file erase operation in progress	System is actively erasing stored reports or patient data	info
`ERASING REPORT`	Report data being erased	User initiated report deletion	info
`ERASING REPORT 51`			unknown
`EtCO2 COM ERROR`	Capnography module communication error	Serial or network communication failure between main unit and EtCO2 module	error
`EtCO2 COM ERROR`	End-tidal CO2 module communication error	EtCO2 module interface communication failure	error
`EtCO2 COM ERROR 51`			unknown
`FAX DIALING`	Fax transmission is dialing destination number	During automated fax transmission	info
`FAX DIALING`	Fax transmission dialing in progress	System initiating fax connection to remote number	info
`FAX DIALING`	Fax modem dialing in progress	Fax transmission initiated	info
`FAX DIALING 51`			unknown
`FAX DONE`	Fax transmission completed	Fax send operation has finished successfully or with error	info
`FAX DONE 51`			unknown
`FAX PREPARING`	Fax transmission preparation in progress	System preparing data for fax transmission	info
`FAX PREPARING`	System is preparing fax data for transmission	During fax setup phase	info
`FAX PREPARING 51`			unknown
`FAX SENDING`	Fax transmission in progress	Device is actively transmitting fax data over communication line	info
`FAX SENDING`	Fax is actively transmitting data	During fax document transmission	info
`FAX SENDING 52`			unknown
`INSERT CARD`	System requesting PCMCIA card insertion	Card reader detected empty slot	info
`INSERT CARD`	Memory card insertion required	System requires PCMCIA or memory card to be inserted in card slot	info
`INSERT CARD`	Memory card not installed during manual/semi-automated modes	No card detected at startup or operation	warning
`INSERT CARD 52`			unknown
`LOW BATTERY`	Internal battery charge level is critically low	When battery voltage drops below minimum threshold	warning
`LOW BATTERY`	Battery voltage below minimum operating level	Battery voltage drops below threshold	warning
`LOW BATTERY`	Low battery.	Battery charge level low	warning
`LOW BATTERY 52`			unknown
`NO CARD INSERTED`	Card is not installed in PCMCIA slot	When attempting to read from memory card without card present	warning
`NOISY ECG`	ECG signal quality degraded by noise or artifact	Continuous during monitoring when noise detected	warning
`NOISY ECG`	Excessive noise in ECG signal exceeding acceptable threshold	Number of noisy analysis intervals exceeds threshold	warning
`NOISY ECG`	Number of noisy analysis intervals exceeds threshold.	Excessive noise in ECG signal	warning
`NOISY ECG 52`			unknown
`NO QRS DETECT`	No QRS complex detected	ECG signal absent or QRS detection failed	warning
`NO QRS DETECT`	QRS complex not detected in ECG signal	During ECG analysis or during pacing operation	warning
`NO QRS DETECT`	No QRS complex detected in ECG signal	ECG signal processing fails to identify QRS complex	warning
`NO QRS DETECT`	Unit is in sync mode and heart rate is < 20 BPM or QRS amplitude is too low for proper synchronization.	Sync mode with low heart rate or low QRS	warning
`NO QRS DETECT 52`			unknown
`NO SHOCK AD`	Defibrillation not advised by analysis algorithm	After ECG rhythm analysis	info
`NO SHOCK AD`	No shock advisable or no shockable rhythm detected	Defibrillation analysis determines rhythm not shockable	info
`NO SHOCK AD 52`			unknown
`NO SHOCK ADV`	No defibrillation advised; non-shockable rhythm analysis result	ECG analysis complete indicating non-shockable rhythm	info
`OPEN AIR DISCHARGE`	Cap voltage too high after discharge attempt, e.g., full energy discharge did not occur.	Discharge without proper load (pads not connected)	critical
`PACER DISABLED`	Pacing function disabled via configuration or fault	Pacing capability disabled	critical
`PACER DISABLED`	User prompt issued simultaneously with other pace faults if pacing is disabled.	Pacing disabled by configuration or fault	error
`PACER FAULT 115`	Flyback pulse width control circuit is not under proper control of the processor and gate array.	Pacing control circuit failure	error
`PACER FAULT 116`	XPACE_ON detection failure	Unable to detect XPACE_ON signal	critical
`PACER FAULT 116`	Failure to detect XPACE_ON signal	Pace enable signal not detected	critical
`PACER FAULT 117`	Pace relay is stuck closed.	Pacing relay malfunction	error
`PACER FAULT 121`	Pace pulse width outside acceptable range during pacing	Pace pulse width less than 30ms or greater than 50ms	error
`PACER FAULT 121`	During pace, the pace pulse width <30ms or >50ms.	Pacing pulse width out of range	error
`PACER FAULT 122`	Pace current is more than 15mA above and below selected value.	Pacing current deviation exceeds limit	error
`PACER FAULT 123`	Measured pacing rate too fast compared to selected rate	Actual pacing rate exceeds programmed rate	error
`PACER FAULT 126`	Issued in conjunction with message 122. Pace current is more than 15mA and below selected value.	Pacing current below selected value	error
`PADDLE FAULT`	Cannot detect paddle type	Accessory type unrecognized	error
`PADDLE FAULT`	Cannot detect type of accessory paddle attached to universal cable	Paddle identification failure during initialization	critical
`PERFORM CPR`	Advisory message in AED auto defib mode.	No shock advised; CPR needed	info
`PERFORM CPR`	Advisory to perform cardiopulmonary resuscitation	Issued in auto defib mode during cardiac arrest	unknown
`PLACE ON ZERO CELL`	EtCO2 sensor cable plugged into unit for the first time. Zeroing error or probe drift error detected.	First sensor connection or calibration error	warning
`POOR LEAD CONTACT`	One or more ECG leads are poorly connected or not connected to patient. (User configurable.)	ECG lead connection loss or degradation	warning
`POOR PAD CONTACT`	Defibrillation electrode impedance exceeds acceptable threshold	Measured impedance between paddle/pads exceeds threshold	unknown
`POOR PAD CONTACT`	Defibrillation pad impedance high	Pad electrode impedance exceeds threshold	warning
`PRESS ANALYZE`	Alternate message for check patient prompt	User prompt to initiate ECG analysis	info
`PRESS CHARGE`	Advisory message; defibrillation advised; press charge button	ECG analysis complete indicating shockable rhythm	unknown
`PRESS SHOCK`	Prompt to deliver shock; defibrillator charged and ready	Issued in AED auto defib mode when capacitor fully charged	unknown
`RECORDER FAULT 142`	Paper chart recorder system error	Recorder hardware or paper feed malfunction	error
`RECORDER FAULT 143`	Strip chart failed power-up echo test. Communications error.	Recorder communication failure at boot	error
`RECORDER FAULT 147`	Strip chart printhead over temperature.	Print head temperature excessive	error
`RELEASE BUTTONS`	Simultaneous external paddle button presses before full charge	Both paddle buttons pressed during charging	info
`RELEASE SHOCK`	Discharge switch(es) closed when pressing charge button. Discharge button pressed before defib reached ready state.	Shock button pressed before charging complete	warning
`RELEASE SHOCK`	Discharge button pressed before defib ready or switch closed prematurely	Premature shock attempt or stuck discharge switch	warning
`REPLACE BATTERY`	Battery critically low	Battery voltage below absolute minimum	critical
`REPLACE BATTERY`	Battery voltage below absolute minimum; shutdown imminent	Battery voltage critically low at power-up	critical
`REPLACE CARD`	Memory card write error during manual or semi-automated recording	Attempt to write to memory card during manual or semi-automated mode	warning
`REPLACE EtCO2 SENSOR`	EtCO2 sensor defective	Warm-up exceeds 5 minutes	error
`REPORT FULL`	Summary report memory full	Report buffer exceeded capacity	warning
`REPORT HALTED`	Summary report stops printing unexpectedly	Report printing interrupted during operation	error
`RESERVED 1`	Watchdog timer not functional	Watchdog timer failure detected	critical
`RETRY ANALYSIS`	Advisory in conjunction with noisy ECG signal	ECG acquisition with excessive noise	warning
`RETRY ANALYSIS`	Retry rhythm analysis	Initial rhythm analysis inconclusive or failed	warning
`RETRY ANALYSIS`	ECG analysis failed; system requesting new analysis attempt	After failed rhythm analysis	warning
`RETRY ANALYSIS`	Analysis should be retried	Previous analysis failed, incomplete, or inconclusive result	info
`RETRY ANALYSIS`	Retry ECG analysis or rhythm interpretation	Initial analysis inconclusive or error; device recommends re-analysis	warning
`RETRY ANALYSIS 56`			unknown
`SELECT 30J FOR TEST`	Incorrect energy level selected for self-test	Attempt to run self-test at energy other than 30J	info
`SELECT 30J FOR TEST`	Self test requested at incorrect energy level	Self-test button pressed at energy other than 30J	warning
`SELECT DEFIB MODE`	Analyze button pressed in wrong mode	Analyze button pressed in pace or monitor mode	unknown
`SELECT LIMB LEADS`	Invalid lead selection during active analysis	Paddles or augmented leads selected during continuous analysis	unknown
`SELECT LIMB LEADS`	Paddles selected when continuous ECG analysis active	Paddle or augmented ECG leads selected during continuous analysis	warning
`SELECT PADS`	Incorrect lead selection for analyze function	Lead I, II or III selected when analyze button pressed	info
`SET CLOCK`	Real-time clock failure with invalid date or time	RTC malfunction detected or invalid date/time	critical
`SET PACE mA`	Multiple copy errors in pace current settings	Pace current software or memory error detected	error
`SET PACE mA`	Pacing current setting required or software/memory error	Pacing mode requires current setting or multiple copy errors detected	warning
`SET PACE RATE`	Multiple copies of pace rate don't match	Pace rate parameter mismatch in memory	error
`SET PACE RATE`	Pacing rate setting required or software error	Pacing mode requires rate setting or multiple pace rate copies do not match	warning
`SHOCK ADVISED`	Shockable rhythm detected during analysis	Automatic analysis identifies ventricular fibrillation or pulseless VT	critical
`SpO2 AMBIENT LIGHT`	Ambient light intensity too high for accurate SpO2 measurement	SpO2 sensor exposed to excessive ambient light	warning
`SpO2 COMM ERR`	No communications received from SpO2 module	SpO2 module communication link lost	error
`SpO2 COMM ERR`	SpO2 module communication failure	No transmissions from SpO2 unit received	error
`SpO2 PULSE SEARCH`	SpO2 pulse search in progress	SpO2 sensor acquiring pulse signal	info
`SpO2 SENSOR FAULT 1`	Defective SpO2 sensor detected	SpO2 sensor hardware failure	error
`SpO2 SENSOR FAULT 5`	SpO2 sensor unrecognized	Unrecognized sensor type detected	error
`STAND CLEAR`	Auto defib mode active with patient rhythm being analyzed	Single analysis mode active in auto defib mode with no defib in progress	info
`STAND CLEAR`	Auto defib mode - analysis in progress	Auto defib mode analysis active	info
`SYSTEM FAULT 2`	MCU ROM checksum or RAM test failure	Microcontroller self-test failure detected	critical
`SYSTEM FAULT 36`	P1MON out of range - pace/defib disabled	P1MON measurement out of valid range	error
`SYSTEM FAULT 36`	P1MON count out of range with pace/defib disabled	P1MON less than 412 or greater than 612 A/D counts	critical
`SYSTEM FAULT 37`	Pace/defib and MFE monitoring disabled	Pacing and monitoring system failure	critical
`SYSTEM FAULT 38`	Shutdown failure	Unit fails to shut down on command	critical
`SYSTEM FAULT 38`	Failure to shutdown after shutdown order	System shutdown command failed	critical
`SYSTEM FAULT 5`	ECU RAM or ROM checksum test failure	ECU self-test failure detected	critical
`SYSTEM FAULT 6`	No communications from ECU for 4 seconds	ECU communication timeout	critical
`SYSTEM FAULT 6`	No ECU communications for 4 seconds	ECU communication lost	critical
`SYSTEM FAULT 7`	A/D converter not performing timely conversions	Analog-to-digital converter performance failure	critical
`SYSTEM FAULT 7`	A/D converter failure	Converter not performing timely	critical
`TEST FAILED`	Unit failed 30J self-test for defib peak current	MCU defib ipeak test failure during 30J self-test	critical
`TEST FAILED`	30J self-test failed	MCU ipeak test (defib peak current) test failed	error
`TEST OK`	Unit passed 30J self-test for defib peak current	MCU defib ipeak test successful	info
`TEST OK`	30J self-test passed	MCU ipeak test (defib peak current) test passed	info
`USE PADDLE DISCHG`	Front panel discharge button pressed with incompatible paddles	Discharge button pressed with external paddles or internal spoons with discharge buttons	warning
`USE PADS`	Attempt to defib with paddles in auto defib (AED) mode	Paddles selected instead of pads in AED mode	warning
`USE PADS TO PACE`	External paddles detected in pace mode	Paddles connected during pacing mode	unknown
`USE ROOM AIR ADAPTER`	EtCO2 sensor zeroing with adapter incorrectly placed	Adapter zeroing started with CO2 in adapter or adapter on REF/0 cell	unknown
`USER SETUP REQ`	Cal/config data missing or corrupt	Both cal/config copies invalid	warning
`USER SETUP REQ`	Both copies of calibration/configuration data corrupted or never programmed	Cal/config data checksum failure or missing initialization	warning
`VF ALARMS OFF`	VF alarms disabled in pace mode or with paddles selected	Inappropriate mode for VF alarm operation	warning
`VF ALARMS OFF`	Ventricular fibrillation alarms disabled	VF alarms disabled in pace mode or with paddles selected	warning
`V LEADS OFF`	V lead connector not terminated or V1 lead wire contacting patient	Missing V lead terminator plug or V1 wire touching patient skin	warning
`VX LEADS OFF`	V lead not properly attached to patient	V lead disconnection or poor contact detected	warning
`WRONG CARD TYPE`	Card is the wrong type	When inserting wrong type of memory card in PCMCIA slot	warning
`ZERO CO2 ADAPTER`	New EtCO2 airway adapter requires zero calibration	New adapter detected without calibration	warning
`ZERO CO2 SENSOR`	New EtCO2 sensor requires zero calibration	New sensor detected without calibration	warning

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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.