Defibrillator monitors · LIFEPAK family

Physio-Control LIFEPAK 20: troubleshooting and error codes

The ServiceForge knowledge base holds 186 documented symptoms for the Physio-Control LIFEPAK 20, with 330 ranked causes, 230 diagnostic checks with test points and expected values, and 240 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Not printing caution

Printer does not produce output

Ranked causes

1. Printer test failure (common)
2. Paper not loaded or improper (common)
3. Printer power supply issue (occasional)
4. W14 Printer Flex Cable shorted (occasional)
5. A12 Printer Assembly defective (occasional)
6. A05 UI PCB faulty (unknown)

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

No lead channel sync mark patient safety

Synchronous cardioversion ECG lead sync mark not displayed

Ranked causes

1. Noisy ECG signal (common)
2. ECG cable defective (common)
3. W06 ECG connector defective (common)
4. A02 Patient Parameter PCB faulty (occasional)
5. A01 System PCB faulty (unknown)

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

No lead channel Sync mark displayed patient safety

Synchronous cardioversion Sync mark not displayed on ECG lead channel

Ranked causes

1. Noisy ECG signal (common)
2. Patient cable issue (occasional)
3. W06 ECG connector issue (occasional)
4. A02 Patient Parameter PCB failure (occasional)
5. A01 System PCB sync circuit failure (rare)

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

No remote sync patient safety

Remote synchronization function not working

Ranked causes

1. Remote sync function disabled (common)
2. ECG Out/Sync In connector defective (common)
3. W09 Power Cable defective (occasional)
4. A01 System PCB faulty (occasional)
5. A03 Power Module faulty (occasional)

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

No remote Sync available

Remote sync function does not work; external sync signal not accepted

Ranked causes

1. Remote sync function disabled (common)
2. ECG Out/Sync In connector or power module issue (occasional)
3. W09 Power Cable issue (occasional)
4. A01 System PCB sync circuit failure (rare)
5. Power module sync circuit failure (rare)

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

Unable to complete auto test or user test patient safety

Device cannot successfully run built-in diagnostic tests

Ranked causes

1. Improper test load connection (common)
2. Test plug or shorting bar continuity issue (common)
3. QUIK-COMBO cable continuity issue (common)
4. W01 Therapy Connector defective (occasional)
5. A04 Therapy PCB faulty (unknown)

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

Damaged keypad or labels

Keypad or labels are damaged or worn

Ranked causes

1. Damaged elastomer keypad (common)
2. Damaged product identification label (occasional)
3. Damaged explosion/hazard label (occasional)
4. Damaged operating instruction label (occasional)

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

Hard paddle buttons patient safety

Defibrillator paddle buttons are stiff

Ranked causes

1. Paddle button mechanical issue (common)
2. Hard paddles defective (common)
3. W01 Therapy Connector defective (unknown)
4. A04 Therapy PCB faulty (unknown)

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

Inaudible or garbled audio patient safety

Speaker output absent, quiet, or unintelligible

Ranked causes

1. Audio test failure (common)
2. Speaker connection loose (common)
3. W02 Speaker Assembly defective (common)
4. A01 System PCB faulty (unknown)

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

Pacer does not turn on patient safety

Pacing mode cannot be activated or does not operate

Ranked causes

1. Pacer not enabled or keypad issue (common)
2. Elastomer keypad defective (occasional)
3. A05 UI PCB failure (occasional)
4. Pacer control circuit failure or error code (rare)

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

Printer does not print

Printer produces no output, no paper movement, or no marks on paper

Ranked causes

1. No paper or paper improperly loaded (common)
2. W14 Printer Flex Cable voltage high (occasional)
3. A12 Printer Assembly failure (occasional)
4. A05 UI PCB printer control failure (rare)

First check

Run printer test

Test point: Printer
Expected: Printer test passes
Tools: Run diagnostic test

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

Saturation reading missing or out of tolerance patient safety

SpO2 saturation reading absent or outside normal range

Ranked causes

1. SpO2 cable defective or disconnected (common)
2. SpO2 sensor defective (common)
3. W05 SpO2 Assembly defective (occasional)
4. A06 OEM PCB faulty (occasional)

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

Unable to complete energy delivery auto test high voltage

Defibrillator cannot complete automatic delivered energy test

Ranked causes

1. Test load shorting bar or plug continuity issue (common)
2. QUIK-COMBO cable continuity issue (occasional)
3. W01 Therapy Connector issue (occasional)
4. A04 Therapy PCB failure (rare)

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

Abnormal energy delivery patient safety

Defibrillator delivers unexpected energy

Ranked causes

1. A14 Inductive Resistor faulty (common)
2. A04 Therapy PCB faulty (occasional)
3. A01 System PCB faulty (unknown)

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

Abnormal energy delivery (patient impedance channel broken) patient safety

Defibrillator delivers abnormal or incorrect shock energy to patient

Ranked causes

1. A14 Inductive Resistor open or high resistance (common)
2. A04 Therapy PCB failure (occasional)
3. A01 System PCB failure (rare)

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

Calibration: Computer-assisted module tests

Serial communication, USB interface, battery power, battery I2C, wireless and wireless switch functionality verification

Ranked causes

1. DUT does not communicate with test computer (occasional)
2. Serial to USB adapter misconfiguration or incompatibility (occasional)
3. Weak wireless signal interference (occasional)

First check

Verify wireless network availability

Test point: Test environment
Expected: Operational WPA/WPA2 enterprise or personal signal broadcasted

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

Display is blank

Display is completely blank with no backlighting or text visible

Ranked causes

1. Display backlight/display assembly failure (common)
2. A04 Therapy PCB voltage issue (occasional)
3. Power module failure (rare)

First check

Measure 12V on P21 to ground

Test point: P21 connector
Expected: 12 V to ground
Tools: DMM

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

Display on but power on LED not illuminated

Display functions but power on indicator LED is not lit

Ranked causes

1. UI Flex Cable issue (common)
2. A05 UI PCB failure (occasional)
3. A04 Therapy PCB failure (rare)

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

Display on, no power-on LED

Display shows information but power-on LED not lit

Ranked causes

1. W18 UI Flex Cable defective (unknown)
2. A05 UI PCB faulty (unknown)
3. A04 Therapy PCB faulty (unknown)

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

Display shows white or blue screen

Display is on but shows white or blue screen instead of normal operation

Ranked causes

1. A05 UI PCB voltage issue (common)
2. W18 UI Flex Cable disconnected (occasional)
3. A01 System PCB failure (occasional)

First check

Measure voltage on A05 UI PCB

Test point: C96 connector
Expected: 3.3 V to ground
Tools: DMM

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

ECG analog out missing or out of tolerance patient safety

ECG analog output signal absent or outside spec

Ranked causes

1. Simulator output verification needed (common)
2. ECG display not showing signal (common)
3. W11 ECG out connector defective (common)

ECG gain out of tolerance patient safety

ECG signal amplification outside specifications

Ranked causes

1. Simulator output verification needed (common)
2. ECG cable defective (common)
3. A02 Patient Parameter PCB faulty (occasional)

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

Failure to transfer coincident with Sync mark patient safety

Defibrillator does not deliver therapy when Sync mark aligns properly with R-wave

Ranked causes

1. Sync marker not properly placed on R-wave (common)
2. Keypad button issue or UI PCB failure (occasional)
3. User test failure or error code (rare)

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

Improper button response caution

Buttons do not respond as expected

Ranked causes

1. Keypad malfunction (common)
2. Elastomer keypad defective (common)
3. A05 UI PCB faulty (unknown)

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

Light print caution

Printer output is faint

Ranked causes

1. Improper paper type (common)
2. W14 Printer Flex Cable disconnected (common)
3. A05 UI PCB faulty (unknown)

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

Missing or broken characters in print caution

Printed output has missing or illegible characters

Ranked causes

1. Improper paper type (common)
2. Printhead dirty or clogged (common)
3. A12 Printer Assembly defective (occasional)

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

No ECG patient safety

No ECG signal displayed

Ranked causes

1. ECG cable defective (common)
2. W06 ECG Connector defective (common)
3. A02 Patient Parameter PCB faulty (occasional)

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

No ECG signal patient safety

ECG waveform not displayed; no cardiac rhythm detected

Ranked causes

1. ECG cable disconnected or failed (common)
2. ECG connector failure (occasional)
3. Patient Parameter PCB failure (occasional)

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

No ECG signal displayed

ECG trace is not visible on display or no waveform is present

Ranked causes

1. ECG cable disconnected or damaged (common)
2. W06 ECG connector issue (occasional)
3. A02 Patient Parameter PCB failure (occasional)

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

No paddles channel sync mark patient safety

Synchronous cardioversion paddle sync mark not displayed

Ranked causes

1. Therapy cable defective (common)
2. W01 Therapy Connector defective (common)
3. A01 System PCB faulty (unknown)

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

No paddles channel Sync mark displayed patient safety

Synchronous cardioversion Sync mark not displayed on paddles channel

Ranked causes

1. Therapy cable issue (common)
2. W01 Therapy Connector issue (occasional)
3. A01 System PCB sync circuit failure (rare)

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

No power on patient safety

Device does not power up when turned on

Ranked causes

1. AC power not connected (common)
2. Therapy PCB failure (occasional)
3. Power module failure (occasional)

First check

Verify AC power connection

Test point: Power cord and outlet
Expected: Device plugged in and powered
Tools: None

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

No SpO2 response (no cable detected)

SpO2 sensor not detected; no pulse oximetry signal available

Ranked causes

1. SpO2 cable disconnected or damaged (common)
2. SpO2 sensor defective (occasional)
3. W05 SpO2 Assembly issue (occasional)

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

Printer output is light

Printed output is faint, light, or barely visible

Ranked causes

1. Wrong paper type used (common)
2. W14 Printer Flex Cable connection issue (occasional)
3. A05 UI PCB printhead control issue (occasional)

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

SpO2 saturation reading missing or out of tolerance

SpO2 value not displayed or reading is outside expected physiological range

Ranked causes

1. SpO2 cable or sensor issue (common)
2. W05 SpO2 Assembly failure (occasional)
3. A06 OEM PCB failure (occasional)

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

Therapy cable leads off high voltage

QUIK-COMBO therapy cable not properly connected

Ranked causes

1. QUIK-COMBO cable continuity broken (common)
2. W01 Therapy Connector defective (common)
3. A01 System PCB faulty (unknown)

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

Therapy cable leads off (QUIK-COMBO only) patient safety

QUIK-COMBO therapy cable disconnects or lead continuity is broken

Ranked causes

1. QUIK-COMBO cable continuity broken (common)
2. W01 Therapy Connector disconnected (occasional)
3. A01 System PCB therapy circuit failure (rare)

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

Therapy ECG gain out of tolerance patient safety

Therapy paddle ECG signal amplification outside spec

Ranked causes

1. Simulator output verification needed (common)
2. Therapy cable defective (common)
3. A01 System PCB faulty (occasional)

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

Unit does not power on high voltage

Defibrillator does not turn on when power button is pressed

Ranked causes

1. Not connected to AC power or UI power issue (common)
2. UI flex cable issue (occasional)
3. Power module failure (occasional)

First check

Verify AC power connection

Test point: AC outlet
Expected: Power connected
Tools: Visual inspection

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

AED mode not functioning patient safety

AED mode does not activate, voice prompts inaudible, or device fails to switch to manual mode when energy select pressed

Ranked causes

1. Hard paddles not properly installed or analyzer not connected (common)
2. Device speaker or voice prompt system malfunction (occasional)

First check

Connect therapy cable/paddles and press ANALYZE key to activate AED mode

Test point: Device ANALYZE key, display
Expected: AED mode activated

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

Audio is inaudible or garbled

Speaker produces no sound or produces garbled, distorted sound

Ranked causes

1. Speaker disconnected or defective (common)
2. A01 System PCB audio circuit failure (rare)

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

Audio output distorted or silent patient safety

Voice messages or tone alerts are not clear or not audible

Ranked causes

1. Speaker damage or audio circuit fault (rare)
2. Audio mute setting enabled (occasional)

First check

Trigger voice prompt and tone sequences

Test point: Speaker output
Expected: Clear, undistorted voice and tone messages

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

Backup battery does not operate caution

Unit cannot run on backup battery; device powers off when AC is disconnected

Ranked causes

1. A07 Battery dead or missing (common)
2. Power module charging circuit failure (occasional)

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

Calibration: Maintenance prompt interval

Set or reset the scheduled preventative maintenance prompt interval

Ranked causes

1. Configure maintenance reminder schedule (unknown)
2. Reset maintenance interval after performing maintenance (common)

First check

Display MAINT PROMPT menu and select INTERVAL option

Test point: Service screen - MAINT PROMPT option
Expected: Menu shows OFF, 3 MONTHS, 6 MONTHS, 12 MONTHS choices

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

Chassis leakage current elevated high voltage

Leakage current from chassis to ground exceeds safe limits in any polarity/neutral configuration

Ranked causes

1. Insulation breakdown in power supply (rare)
2. Wet or contaminated PCB (occasional)

First check

Measure leakage current (Neutral Closed, Normal polarity, Lead-Chassis Normal)

Test point: Leakage path simulation
Expected: < 100 µA (medical equipment standard)
Tools: Leakage current tester

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

Earth leakage current elevated high voltage

Leakage current from device to earth exceeds safe limits across all polarity/neutral states

Ranked causes

1. Insulation failure in patient circuit (rare)
2. Contamination or moisture in patient connections (occasional)

First check

Measure earth leakage (Neutral Closed, Normal polarity)

Test point: Earth connection path
Expected: < 100 µA
Tools: Leakage current tester

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

ECG gain out of tolerance (3 or 5-lead)

ECG signal amplitude does not meet gain specifications on lead inputs

Ranked causes

1. ECG simulator or cable issue (common)
2. A02 Patient Parameter PCB failure (occasional)

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

ECG lead leakage current elevated patient safety

Leakage current between ECG leads or to ground exceeds safe limits across all test configurations

Ranked causes

1. ECG cable insulation damaged or wet (occasional)
2. ECG input isolation circuit failure (rare)

First check

Measure lead-to-ground leakage (Neutral Closed, Normal, Lead-Gnd Normal)

Test point: ECG lead connections
Expected: < 50 µA
Tools: Leakage current tester

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

ECG lead signal amplitude out of range

5-lead ECG gain does not meet specification during acquisition

Ranked causes

1. Loose or damaged ECG cable (common)
2. ECG preamplifier circuit fault (rare)

First check

Record 5-lead ECG gain amplitude

Test point: ECG lead input
Expected: 36 to 44 mm, 36 to 44 mm

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

ECG signal has no amplitude

ECG trace displays flat line or zero amplitude signal

Ranked causes

1. ECG cable disconnected or damaged (common)
2. A02 Patient Parameter PCB failure (occasional)

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

Fails ground resistance test high voltage

Unit fails ground continuity or grounding resistance safety test

Ranked causes

1. Power cord grounding issue (common)
2. Power module grounding circuit failure (occasional)

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

Frozen at power-on screen caution

Device stops at startup screen

Ranked causes

1. W18 UI Flex Cable defective (unknown)
2. A01 System PCB faulty (unknown)

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

Ground resistance out of specification high voltage

Measured ground resistance does not meet safety requirements

Ranked causes

1. Loose or corroded ground connection (common)
2. Ground conductor broken or high-resistance path (occasional)

First check

Measure DC ground resistance

Test point: Chassis ground point to mains earth
Expected: < 0.1 ohms (typical for medical equipment)
Tools: Ohmmeter with 4-wire capability

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

HARD PADDLE key not responding patient safety

HARD PADDLE key does not respond when pressed

Ranked causes

1. Hard paddles damaged or connector issue (common)
2. A04 Therapy PCB failure (occasional)

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

Keypad buttons not responding properly

Buttons do not respond to presses or respond inconsistently

Ranked causes

1. Elastomer keypad worn or damaged (common)
2. A05 UI PCB button circuit failure (occasional)

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

Loose or broken hardware caution

Loose or broken components on the device

Ranked causes

1. Loose hardware (common)
2. Broken components (occasional)

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

Low patient impedance

Patient impedance measurement lower than expected

Ranked causes

1. Incorrect test load used (common)
2. A01 System PCB faulty (occasional)

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

Low patient impedance during test

Patient impedance measurement is lower than expected during testing

Ranked causes

1. Wrong test plug used or test procedure issue (common)
2. A01 System PCB impedance measurement failure (occasional)

First check

Test into 50 ohm load during 3 A.M. test

Test point: Test load
Expected: Correct test plug used
Tools: 50 ohm test load

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

Maintenance Due message remains on screen

Maintenance alert persists on display

Ranked causes

1. Maintenance prompt interval not set (common)
2. Maintenance prompt interval needs reset (common)

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

No ac power reminder tone caution

AC power availability alert tone not sounding

Ranked causes

1. User configuration setting incorrect (common)
2. A03 Power module faulty (occasional)

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

More symptoms

No AC power reminder tone or alert
No amplitude ECG
No backup battery operation
No display (white or blue screen)
Pacer output current out of tolerance
Printer characters are missing or broken
Printer malfunction or not installed
Printer test strip defects
QUIK-COMBO ECG analog output missing or out of tolerance
QUIK-COMBO ECG gain out of tolerance
Remote sync function not responding to synchronization signal
Remote sync LED not flashing
Service code logged, service LED on
Speed Dial not functioning
SpO2 leakage current elevated
SpO2 probe signal not detected or reading out of range
SpO2 reading out of specification
Standard Paddles ECG gain out of tolerance
Therapy delivered energy out of tolerance
Therapy ECG characteristic amplitude out of range
Therapy impedance sense malfunction
Therapy impedance sense not functioning
Therapy leakage current elevated
Unit frozen at power on screen
User test does not complete or report not printed
AC Mains indicator not on
AC power LED on LIFEPAK 20 device not illuminated
Accessory cables or sensors expired or unsuitable
Calibration: Audio test
Calibration: Chassis Leakage Current
Calibration: CO2 measurement
Calibration: Defibrillation
Calibration: Defibrillator isolation
Calibration: Earth leakage current normal condition
Calibration: Earth leakage current single fault condition
Calibration: Ground Resistance
Calibration: Keypad test
Calibration: LIFEPAK 20 TCP setup
Calibration: LIFEPAK 20/20e instrument calibration
Calibration: Pacer Leads Off Detection
Calibration: Pacer Option Characteristics
Calibration: Pacer Output Current
Calibration: Performance Inspection Procedure
Calibration: Performance Inspection Procedure
Calibration: Pixels test
Calibration: Printer test
Calibration: Protective earth resistance CodeManagement Module ground stud
Calibration: Protective earth resistance defibrillator ground stud
Calibration: Reset Maintenance Prompt
Calibration: Service Mode Passcode
Calibration: Standard Paddles Defibrillation Isolation
Calibration: Standard Paddles Delivered Energy
Calibration: Standard Paddles ECG Characteristics
Calibration: Standard Paddles Remote Synchronous Cardioversion
Calibration: Standard Paddles Synchronous Cardioversion R-Wave
Calibration: Standard Paddles User Test
Calibration: TCP - Resource Requirements
Calibration: TCP Defibrillator
Calibration: TCP Defibrillator Isolation
Calibration: TCP delivered energy
Calibration: TCP setup
Carrying strap or mounts damaged or missing
CHECK PRINTER message does not appear
Connectors damaged or contaminated
Continuous reset
Contrast Test
Date and time incorrect
Defibrillation capacitor charge/dump operation fails
Defibrillator capacitor charge/dump cycle fails during USER TEST
Defibrillator isolation failure
Delivered energy at 10 joules out of range
Delivered energy at 100 joules out of range
Delivered energy at 15 joules out of range
Delivered energy at 2 joules out of range
Delivered energy at 360 joules out of range
Delivered energy at 50 joules out of range
Delivered energy at 70 joules out of range
Delivered energy out of tolerance
Device beeps when turned off
Device exterior damage or wear
Dirt, fluids, or foreign objects on device
Dirt, fluids, or foreign objects present
Display does not illuminate
Display is distorted
Display pixel anomalies
Distorted display
ECG analog output amplitude out of range
ECG leads not detected
ECG signal amplitude out of specification
ECG signal is saturated
Fails chassis leakage current test
Fails chassis leakage test
Hidden switch between OPTIONS and PAUSE not functioning
Keypad button not responding
Keypad controls unresponsive
Keypad or overlays damaged
LCD contrast insufficient
LIFEPAK 20 Device Data Checksum Error
LIFEPAK 20 Device Serial Port Communication Failure
Loose or rattling hardware inside device
MAINTENANCE DUE indicator remains on
No CO2 Operation displayed on monitor
No wireless connection to LIFENET System
Non-volatile RAM Integrity Test Failure
Pacer leads off detection failed
Pacer pulse width out of specification
Pacing current or rate out of tolerance
Pacing current/rate out of tolerance
Paddles ECG signal amplitude out of specification
Paddles require cleaning
Pixel Test
Power on sequence incomplete
Real Time Clock Failure
Remote sync energy transfer failed
Rubber feet damaged or missing
Service indicator illuminated
Service indicator LED illuminates after power-on
Service indicator LED illuminates during self-test
SERVICE indicator lights during self-test
SERVICE indicator remains on
Synchronization delay excessive
Therapy delivered energy out of specification
Therapy user test failed
Unit continuously resets
User Test Failed
Voice prompts inaudible or distorted

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

Error codes

Code	Meaning	Trigger	Severity
`0002`	System Flash memory voltage error	Flash memory access	error
`0003`	Cannot erase system Flash memory	Memory erase operation	error
`0004`	Cannot write to system Flash memory	Memory write operation	error
`0006`	System ADC read error	ADC read operation	error
`0007`	System DAC not responding	DAC access during operation	error
`0008`	ECG OUT DAC self-test failed	ECG output DAC self-test fails	critical
`000a`	System ADC background test failed	Analog-to-digital converter self-test fails	critical
`000b`	System ADC failed self-calibration	ADC self-calibration procedure fails	critical
`000c`	System Flash memory ID unknown	Flash memory chip identification fails	critical
`000d`	System hardware/software configuration lost	Configuration data becomes unavailable	critical
`01`	Real Time Clock Failure	Real Time Clock failure detected by CodeManagement Module self-test	warning
`02`	Non-volatile RAM Integrity Test Failure	Non-volatile RAM integrity test failure detected	warning
`03`	LIFEPAK 20 Device Data Checksum Error	Data checksum error detected in LIFEPAK 20 device	error
`04`	LIFEPAK 20 Device Serial Port Communication Failure	Serial port communication failure between CodeManagement Module and LIFEPAK 20	error
`100e`	UI – system communication lost	UI-System communication failure	critical
`100f`	Display update timer error	Display update timer malfunctions	error
`1010`	Display update queue error	Display update queue processing fails	error
`1013`	System detected unexpected UI reset	UI resets unexpectedly during operation	error
`1014`	Voice prompt/audio watchdog failure	Audio system watchdog detects failure	warning
`1015`	USB data time-out error	USB data transfer exceeds time limit	error
`1016`	UI USB data error	USB data corruption detected on UI interface	error
`1c01`	UI FPGA programming error	Field programmable gate array programming fails	error
`1c02`	UI FPGA verification error	FPGA verification fails after programming	error
`1c03`	UI FPGA program file error	FPGA program file is corrupted or missing	error
`1c04`	UI ADC not functioning	User interface ADC converter fails	error
`1c05`	Printer ADC out of tolerance (temperature)	Printer temperature sensor reading out of spec	warning
`1c06`	Printer ADC out of tolerance (voltage)	Printer voltage sensor ADC reading exceeds limits	warning
`1c07`	UI voltage out of tolerance (5 V)	5V power supply reading out of spec	error
`1c08`	UI voltage out of tolerance (3.3 V)	3.3V supply on UI PCB exceeds tolerance	error
`1c09`	UI voltage out of tolerance (2.5 V)	2.5V supply on UI PCB exceeds tolerance	error
`1c0a`	UI voltage out of tolerance (35 V)	35V supply on UI PCB exceeds tolerance	error
`1c0b`	UI voltage out of tolerance (SW VBATT)	Switched battery voltage on UI PCB exceeds tolerance	error
`1c0c`	UI voltage out of tolerance (ground)	Ground reference voltage on UI PCB out of range	error
`1c0f`	UI hardware I.D. corrupted	Hardware identification data on UI PCB becomes corrupted	critical
`1c10`	UI boot program corrupted	UI boot program becomes corrupted	critical
`1c11`	UI application Flash memory corrupted	UI application code in Flash memory corrupted	critical
`1c12`	UI font Flash memory corrupted	Font data in UI Flash memory corrupted	critical
`1c13`	UI FPGA Flash memory corrupted	FPGA program in Flash memory corrupted	critical
`1c16`	UI CPU RAM test failed on power-on	UI RAM self-test fails during power-on	critical
`1c17`	UI CPU RAM test failed during normal operation	UI RAM test fails during normal operation	critical
`1fff`	Additional information related to prior error code	Logged before another error code for diagnostic context	info
`2004`	System cannot initialize serial port (system connector)	Serial port initialization fails	error
`2005`	System cannot initialize driver for serial port	Serial port driver fails to initialize	error
`3001`	System cannot use data management Flash memory	Data management Flash memory becomes unavailable	error
`3002`	System data management Flash memory corrupted	Data management Flash memory data becomes corrupted	critical
`3005`	System cannot delete DM record	Data management record deletion fails	error
`3007`	System cannot create new DM record	Data management record creation fails	error
`3008`	System could not store DM record	Data management record storage fails	error
`3009`	System could not erase oldest DM record	Cannot erase oldest data management record when memory full	error
`300a`	System cannot clear DM memory	Data management memory clear operation fails	error
`300b`	System error writing DM record	Data management record write operation fails	error
`300c`	System cannot read archived DM record	Cannot read archived data management record	error
`3010`	System error DM memory corrupt	Data management memory corruption detected	critical
`3fff`	Additional information related to prior error code	Logged before another error code for diagnostic context	info
`4005`	System NVRAM error log	Non-volatile RAM error log becomes corrupted	error
`4006`	Error log queue not functioning	Error logging queue malfunctions	error
`4008`	Error log count corrupted	Error log counter becomes corrupted	error
`4009`	System RAM test failed	System RAM self-test fails	critical
`400a`	System program Flash memory corrupted	System program code in Flash memory corrupted	critical
`400b`	Program contents failure	System program code verification fails	critical
`400c`	System ADC voltage low	System power supply voltage falls below minimum	warning
`400d`	System ADC voltage high	System power supply voltage exceeds maximum	warning
`4010`	Service LED failed	Service indicator LED fails to illuminate	warning
`4012`	Voice Flash memory corrupted	Voice prompts in Flash memory corrupted	warning
`4013`	Voice/font Flash memory invalid	Voice and font data in Flash memory invalid	warning
`4fff`	Additional information related to prior error code	Logged before another error code for diagnostic context	info
`5001`	System watchdog failed	Watchdog timer failure	critical
`5003`	System watchdog failed	Watchdog timer failure	critical
`5004`	System watchdog reset	System watchdog forces reset	error
`5005`	System CPU error during boot-up	CPU encounters error during startup	critical
`5006`	System RAM failed during boot-up	RAM self-test fails during startup	critical
`5007`	System checksum failure during boot-up	Boot code checksum verification fails	critical
`5008`	System boot program failure	Boot program execution fails	critical
`5009`	Real-time clock (RTC) access failed	RTC becomes inaccessible	error
`500a`	Coin cell battery not detected	Backup battery missing or connection lost	warning
`500b`	Cannot use system NVRAM	Non-volatile RAM becomes unavailable	error
`500c`	System application start error	System application fails to start	error
`500d`	System software initialization time out	System initialization exceeds time limit	error
`500e`	System application start error	System application fails to start	error
`5010`	Configuration mismatch	System configuration inconsistent	warning
`5011`	NVRAM configuration data error	Configuration data in NVRAM corrupted	error
`5012`	Configuration data error	Configuration data becomes corrupted	error
`5013`	System meter initialization error	Meter initialization fails	warning
`5014`	System meter mismatch	Meter configuration mismatch detected	warning
`5015`	NVRAM error	Non-volatile RAM error	error
`5016`	MFG data mismatch	Manufacturing data inconsistency	error
`5017`	NVRAM MFG data lost	Manufacturing data in NVRAM lost	critical
`5018`	Watchdog reset failed	Watchdog reset operation fails	critical
`5019`	NVRAM corrupted	Non-volatile RAM data corrupted	critical
`501a`	NVRAM corrupted	Non-volatile RAM data corrupted	critical
`501c`	RTC not running	Real-time clock stops running	warning
`501d`	RTC out of sync	Real-time clock time synchronization lost	warning
`501e`	System software execution error	Software execution error occurs	error
`501f`	System software read error	Software read operation fails	error
`5020`	System software write error	Software write operation fails	error
`5021`	System software error	System software encounters error	error
`5022`	System software exception code	Software exception occurs	error
`5023`	System software exception code	Software exception occurs	error
`5024`	System software exception code	Software exception occurs	error
`5026`	NVRAM low battery interrupt	Backup battery voltage falls below threshold	warning
`5027`	System USB did not initialize	System USB interface fails to initialize	error
`5028`	PP USB did not initialize	Patient module USB interface fails to initialize	error
`5029`	Therapy USB did not initialize		error
`502a`	UI USB did not initialize		error
`502b`	USB system failed		error
`502f`	Device type invalid		error
`5030`	PP USB disconnect		error
`5031`	UI USB disconnect		error
`5032`	Therapy USB disconnect	USB connection lost between therapy module and system	error
`5033`	PP USB download time out	PP module fails to complete USB download within timeout window	error
`5036`	USB initialization failed	USB subsystem fails to initialize	error
`5037`	USB unitization error	USB unit fails to initialize properly	error
`5038`	Cannot clear interrupt source	Interrupt source cannot be cleared during shutdown or reset	error
`5039`	Bus error reported by USB PP channel	PP module reports USB bus error	error
`503a`	Bus error reported by USB UI channel	UI module reports USB bus error	error
`503b`	Bus error reported by USB therapy channel	Therapy module reports USB bus error	error
`503c`	USB host driver cannot create transfer descriptor	USB host driver fails to allocate transfer descriptor	error
`503d`	USB host driver received message larger than maximum allowed	Received USB message exceeds size limit	error
`5040`	Inconsistent RTC time	Real-time clock value is inconsistent or corrupted	warning
`5105`	Battery failed to reach charge in 2.5 hours		error
`5106`	Power supply out of tolerance	Power supply voltage outside acceptable range	error
`5107`	Power module RAM error	RAM test failure in power module	error
`5108`	Power module self-test service code	Power module self-test failure detected	error
`510a`	Battery <10volts after 20minutes of charging	Battery charge cycle fails to reach minimum voltage	warning
`510b`	Does not switch to battery power	Device fails to switch to battery when AC power is removed	critical
`510c`	Does not detect ac disconnect	AC disconnect detection circuit failure	critical
`510d`	Battery powered when connected to ac power	Device incorrectly uses battery while AC is connected	error
`510e`	Battery <10volts after charge cycle	Battery voltage remains low after charging	warning
`510f`	Battery charge cycle stopped	Charging process stopped prematurely	error
`5110`	AC isolation Diode Shorted		error
`5112`	Battery not detected	Battery presence or communication not detected	critical
`5115`	Battery thermistor <400 Ohms	Battery thermistor resistance below 400 ohms	error
`5116`	Charger reporting zero during battery charging	Charger circuit reports zero output during charging	error
`5117`	No 12C connection detected	I2C communication link lost (LIFEPAK 20e only)	error
`5118`	Power module connected to NiMH battery	Power module for lithium battery connected to NiMH battery (LIFEPAK 20 only)	error
`511a`	Battery failure	Battery has reached end of life or is defective	error
`5fff`	Additional information related to prior error code		info
`6002`	PP program corrupted	Pulsepoint processor program memory corrupted	error
`6003`	PP program not found	Pulsepoint processor program not present in memory	error
`6004`	PP boot-up error	Pulsepoint processor fails to boot	error
`6009`	No PP data		error
`600c`	SpO2 misconfigured	SpO2 module configuration is incorrect	warning
`600e`	PP reset	Pulsepoint processor reset unexpectedly	warning
`600f`	OEM configuration error	OEM-specific configuration is invalid	warning
`6010`	PP initialization error	Pulsepoint processor fails to initialize	error
`6018`	Incorrect updated SpO2 image	SpO2 firmware image update is incorrect or corrupted	error
`6019`	Incorrect updated SpO2 image CRC	SpO2 firmware image CRC check failed after update	error
`6801`	PP power supply out of tolerance	Pulsepoint processor power supply voltage out of range	error
`6802`	PP pre-amp data invalid	Pulsepoint processor pre-amp output invalid	error
`6804`	PP data RAM test error	Pulsepoint processor data RAM test failure	error
`6805`	PP RAM test error	Pulsepoint processor RAM test failure	error
`6806`	PP CRC test error	Pulsepoint processor program CRC check failure	error
`6807`	PP ECG test error	Pulsepoint processor ECG test failure	error
`680b`	SpO2 board error	SpO2 module hardware failure detected	error
`6fff`	Additional information related to prior error code		info
`800a`	System DSP error	Digital signal processor firmware error	error
`8013`	Voice format error	Voice message format is invalid or corrupted	warning
`8014`	No paddles data	Paddles firmware or data not available	error
`801b`	DSP did not receive USB SOF interrupt	DSP fails to receive USB start-of-frame interrupt	error
`8105`	Impedance channel out of calibration	Impedance measurement circuit calibration lost	error
`8108`	Paddles data out of sync	Paddles firmware synchronization lost	error
`8109`	Paddles pre-amp user test failed	Paddles pre-amp self-test failure	error
`810b`	Real impedance <-30 ohms for one second	Measured impedance is negative or out of range	error
`8fff`	Additional information related to prior error code		info
`9004`	Unable to initialize therapy control	Therapy control circuit fails to initialize	critical
`9005`	Defib disabled	Defibrillation circuit disabled by firmware	critical
`9007`	Shock not delivered	Defibrillation shock failed to deliver	critical
`9009`	Defib charge time expired		critical
`900b`	Pacing rate out of tolerance	Pacing rate outside acceptable range	critical
`900f`	Unable to initialize therapy control	Therapy control stack initialization failure	critical
`9011`	Pacer fault	Pacemaker circuit hardware failure	critical
`9017`	Pacer disabled	Pacemaker circuit disabled	warning
`901a`	Pacer rate storage corrupted	Pacemaker rate data memory corrupted	error
`901b`	Therapy PCB communication lost	Communication link to therapy PCB lost	critical
`901d`	Testing purpose only	Reserved test code	info
`9021`	Impedance value indicates regulator failure in System PCB pre-amp	System PCB pre-amp regulator detected as failed	error
`9c03`	Therapy processor unplanned reset	Therapy processor reset unexpectedly	error
`9c04`	Therapy/system controller communication watchdog	Communication watchdog timeout between therapy and system controllers	critical
`9c05`	CRC error	Therapy processor program CRC check failed	error
`9c06`	Calibration constant A out of range	Therapy calibration constant A is outside acceptable limits	error
`9c07`	Calibration constant B out of range	Therapy calibration constant B is outside acceptable limits	error
`9C08`	Therapy ROM Cyclic Redundancy Check (CRC) failed		error
`9c09`	Therapy RAM pattern write test failed	Therapy processor RAM write test failure	error
`9c0a`	Therapy relay idle coil voltage out of range	Therapy relay idle state coil voltage out of spec	error
`9c0b`	Therapy relay enabled coil voltage out of range (5 ms)	Therapy relay enabled state coil voltage at 5ms out of spec	error
`9c0c`	Therapy relay enabled coil voltage out of range (100 ms)	Therapy relay enabled state coil voltage at 100ms out of spec	error
`9c0d`	Therapy relay drive enabled coil voltage out of range	Therapy relay drive enable coil voltage out of spec	error
`9c0f`	Therapy/power assembly communication error	Communication lost between therapy and power modules	critical
`9c11`	Capacitor Dump failed	High voltage capacitor discharge failed	critical
`9C12`	Therapy pcba 5 volt out of range		error
`9C13`	Therapy pcba 15 volt out of range		error
`9c14`	Therapy pcba -15 volt out of range		error
`9c15`	Therapy ADC time out error	Analog-to-digital converter response timeout	error
`9C18`	3AM H bridge test: NE leg shorted		error
`9C19`	3AM H bridge test: SE leg shorted		error
`9C1a`	3AM H bridge test: NW leg shorted		error
`9C1b`	3AM H bridge test: SW leg shorted		error
`9C1c`	3AM H bridge test: East side stuck open		error
`9C1d`	3AM H bridge test: West side stuck open		error
`9C1e`	3AM H bridge test: Charge time out of range		error
`9c1f`	3:00 AM shorted paddles relay contact test: relay shorted		error
`9c20`	Shorted paddles relay contact test failure	3:00 AM shorted paddles relay contact test detected relay shorted	error
`9c21`	Pace drive power supply stuck on	3:00 AM pace drive test detected power supply stuck in on state	error
`9c22`	Pace drive power supply inoperable	3:00 AM pace drive test found power supply not functioning	error
`9c23`	Relay contacts shorted in pace drive	3:00 AM pace drive test detected shorted relay contacts	error
`9c24`	Relay drive low side shorted	3:00 AM pace drive test detected low side short circuit	error
`9c25`	Relay drive high side shorted	3:00 AM pace drive test detected high side short circuit	error
`9c26`	Pace FET shorted	3:00 AM pace drive test detected shorted field effect transistor	error
`9c27`	Pace current path open	3:00 AM pace drive test detected open circuit in current path	error
`9c28`	Pace set point error	3:00 AM pace drive test detected incorrect pace set point value	error
`9c29`	Redundant controls stuck on	3:00 AM redundant controls test detected controls stuck in on state	error
`9c2a`	Redundant controls enable 2 stuck on	3:00 AM redundant controls test detected enable 2 stuck on	error
`9c2b`	Redundant controls enable 1 stuck on	3:00 AM redundant controls test detected enable 1 stuck on	error
`9c2c`	Capacitor voltage per pacing pulse too high	Pacing pulse capacitor voltage exceeds specification	error
`9c2d`	Capacitor current per pacing pulse too high	Pacing pulse capacitor current exceeds specification	error
`9c2e`	Cap current per pacing pulse too high	Pacing pulse capacitor current exceeds specification	error
`9c2f`	Pacing current and selected current out of range	Measured pacing current does not match programmed value	error
`9c30`	Pacing pulse width too short	Pacing pulse width is shorter than specification	error
`9c31`	Pacing pulse width too long	Pacing pulse width is longer than specification	error
`9c32`	Capacitor voltage and predicted capacitor voltage mismatch	Measured capacitor voltage does not match predicted value	error
`9C33`	Capacitor charge time >25seconds		error
`9c35`	Therapy CPU instruction test failed	CPU self-test detected instruction execution error	error
`9c36`	Therapy software stack overflow	Software stack memory exceeded during operation	error
`9c3a`	Energy capacitor overvoltage error	Energy capacitor voltage exceeds maximum safe level	critical
`9c3b`	Redundant controls charge rate stuck on	3:00 AM redundant controls test detected charge rate control stuck on	error
`9c3e`	Therapy software error	Software detected an unspecified error condition	error
`9c3f`	Therapy software error	Software detected an unspecified error condition	error
`A00b`	Printer communication lost	Printer interface failure	error
`a00e`	Printer initialization error	Printer fails to initialize during startup	error
`b001`	Invalid state request	System receives invalid state command	error
`b011`	System behavior manager error	System behavior manager encounters error condition	error
`b012`	Energy cap charging time out	Defibrillator capacitor fails to charge within timeout period	warning
`B013`	Shock advisory system error	Algorithm or sensor failure	critical
`b014`	Shock advisory system time out	Shock advisory analysis exceeds time limit	error
`b016`	Motion detect timer error	Motion detection timer malfunctions	warning
`b017`	Shock result time out	Shock delivery monitoring exceeds time limit	error
`b018`	USB interrupt error	USB interrupt handling fails	error
`MAINTENANCE DUE`	Scheduled maintenance interval has passed and maintenance is due	Device powered on after scheduled maintenance interval has expired	warning
`PASSCODE INCORRECT - TRY AGAIN`	Service mode passcode entry was invalid	Incorrect service mode passcode entered when accessing SERVICE menu	warning
`Service Log entry`	Self-test failure detected	Errors detected during power-on or continuous self-test cycles	error

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.