Automated external defibrillators · LIFEPAK family

Physio-Control LIFEPAK 500: troubleshooting and error codes

The ServiceForge knowledge base holds 72 documented symptoms for the Physio-Control LIFEPAK 500, with 93 ranked causes, 107 diagnostic checks with test points and expected values, and 126 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit displays damage or wear patient safety

Visible defects on external surfaces preventing safe operation

Ranked causes

1. Damage to exterior surfaces (unknown)
2. Excessive wear (unknown)
3. Improper mechanical function (unknown)
4. Damaged connectors (unknown)

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

Unit does not power on patient safety

Device fails to charge or respond to operation

Ranked causes

1. Defective test set or setup issue (common)
2. Patient interface connector damaged (occasional)
3. Energy storage capacitor issue (occasional)
4. Main PCW defective (occasional)

First check

Verify test set-up and reset

Test point: test setup
Expected: test setup correct

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

Fault codes recorded in LIFEPAK 500

LIFEPAK 500 AED has recorded one or more fault codes during internal self-test or routine use. Fault codes are stored in the Fault Code Log and may indicate transient electromagnetic interference or electrostatic discharge. Codes may not indicate permanent equipment failure.

Ranked causes

1. Transient electromagnetic interference (EMI) (occasional)
2. Electrostatic discharge (ESD) (occasional)
3. Permanent hardware error (rare)

First check

Review recorded fault code(s) in Fault Code Log

Test point: Fault Code Log memory
Expected: Fault code present with date and time of occurrence

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

Calibration: AED impedance patient safety

Verify AED output impedance matches specification using decade resistance box and test adapter

Ranked causes

1. Impedance calibration required per service procedure (common)
2. Impedance not within specification (unknown)

First check

Verify AED impedance output at test post

Test point: QUIK-COMBO test post adapter
Expected: 225 OHMS Ω
Tools: decade resistance box set to 225 Ω, VP78-QUIK-COMBO test post adapter

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

Calibration: Energy meter baseline and component connection high voltage

Connect all components to LIFEPAK 500 patient connector and establish energy meter baseline

Ranked causes

1. Components must be connected to patient connector for testing (common)
2. Energy meter baseline must be established using LIFEPAK energy meter (common)

First check

Unplug all components from LIFEPAK 500 patient connector

Test point: LIFEPAK 500 patient connector
Expected: all components disconnected

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

Calibration: LIFEPAK 500 boot routine after battery replacement patient safety

Restore normal operation after battery has been replaced in the unit

Ranked causes

1. Battery replacement requires boot routine execution (common)
2. Verify battery status message (common)

First check

Insert fully functional battery

Test point: Battery compartment
Expected: Battery inserted, does not return battery fault indications

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

Calibration: LIFEPAK 500 energy output patient safety

Verify defibrillator delivers specified energy level when PUSH TO SHOCK button is activated during test mode

Ranked causes

1. Energy calibration out of specification (unknown)
2. Calibration procedure execution (unknown)

First check

Access energy calibration screen

Test point: LIFEPAK 500 user interface
Expected: CALIBRATE ENERGY screen displayed

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

Cannot set time or date

Unit will not accept or retain time and date settings

Ranked causes

1. Time/Date clock battery dead or missing (common)
2. Key switch installation improper (occasional)

First check

Verify Time/Date clock battery

Test point: Battery compartment
Expected: Battery present and functional

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

Charge time exceeds specification patient safety

AED takes longer than 15 seconds to charge to 360 J

Ranked causes

1. Battery voltage low or charger circuit slow (common)
2. High-voltage charging circuit degradation (occasional)

First check

Measure charge time from power button to delivery

Test point: AED output; timer
Expected: 360 J in 15 seconds or less, ≤15 s
Tools: Stopwatch or analyzer with timing function

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

Defib output insufficient or weak patient safety

Defibrillator produces reduced or no therapeutic output

Ranked causes

1. Battery low or failing (unknown)
2. Electrode pads defective or expired (unknown)

Electrode impedance test fails patient safety

AED does not respond correctly to electrode impedance tests or readings are incorrect

Ranked causes

1. Electrode cable or connector defect (common)
2. Impedance measurement circuit failure (occasional)

First check

Visually inspect electrode cables and connectors

Test point: Electrode connectors on AED
Expected: No visible damage, corrosion, or loose connections

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

Electrode pads not detected patient safety

Electrodes fail to register or are not recognized

Ranked causes

1. Electrode pads not seated properly (unknown)
2. Low battery or weak battery (unknown)

Energy output and charge time deficient patient safety

Defibrillator will not charge or charges slowly

Ranked causes

1. Faulty functional battery (common)
2. Energy storage capacitor defective (occasional)

First check

Verify battery is fully charged

Test point: battery status
Expected: fully functional battery

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

Energy output incorrect patient safety

AED does not deliver specified energy levels to patient

Ranked causes

1. Capacitor charge or discharge circuit failure (common)
2. Energy calibration drift (occasional)

First check

Measure energy output at 360 J setting

Test point: Defibrillator analyzer input
Expected: 342–378 J for monophasic; 342–378 J for biphasic shock 2, Monophasic 360 J ±5%; Biphasic 100 J ±5%, 360 J ±5%
Tools: Defibrillator analyzer

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

Firmware or system error

Device firmware or internal system malfunction

Ranked causes

1. Firmware corruption or error (rare)
2. Internal voltage reference error (rare)

First check

Run system diagnostics

Test point: Device self-test
Expected: All systems pass

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

Lead-to-lead leakage current excessive high voltage

Leakage current between electrode leads exceeds safe limit

Ranked causes

1. Electrode cable insulation breakdown or contamination (occasional)
2. High-voltage output circuit isolation fault (rare)

First check

Measure lead-to-lead leakage current

Test point: Electrode output connectors
Expected: does not exceed 9 µA, ≤9 µA
Tools: Leakage current meter or digital multimeter on µA range

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

AED fails to connect to analyzer

QUIK-COMBO cable not properly seated or defective

Ranked causes

1. QUIK-COMBO test post adapter not connected (common)

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

Analyze LIFEPAK menu access

Menu navigation to adjust or verify defibrillator calibration settings

Ranked causes

1. Menu system access needed for parameter adjustment (unknown)

First check

Confirm ANALYZE MENU key accessibility

Test point: LIFEPAK 500 keypad
Expected: Menu system responds to key press

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

Auto battery test disabled patient safety

Automatic battery self-test mode is not enabled; unit cannot perform ongoing battery monitoring

Ranked causes

1. Auto battery test mode set to OFF (common)

First check

Verify auto battery test mode setting

Test point: Service Mode menu
Expected: AUTO BATTERY TEST mode is ON

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

Automatic advisory operation failed patient safety

AED does not complete automatic advisory operation diagnostic tests; CPR coaching or shock advisory may be non-functional

Ranked causes

1. Advisory algorithm or analysis circuit failure (unknown)

First check

Verify automatic advisory operation test completion

Test point: AED analysis and advice module
Expected: AED completes all automatic advisory operation tests

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

Automatic advisory operation fails patient safety

AED does not complete automatic advisory operation tests correctly

Ranked causes

1. Software or processing circuit fault (occasional)

First check

Run automatic advisory operation diagnostic

Test point: Service Mode diagnostic menu
Expected: AED completes all automatic advisory operation tests without error

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

Automatic test results fail patient safety

One or more automatic tests display failure instead of PASS in the Automatic Test Results window

Ranked causes

1. Test execution error or equipment malfunction (unknown)

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

Battery auto-test disabled patient safety

AUTO BATTERY TEST mode is not enabled

Ranked causes

1. Auto battery test setting disabled in software (occasional)

First check

Verify AUTO BATTERY TEST mode setting

Test point: Service Mode menu
Expected: AUTO BATTERY TEST mode is set to ON

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

Battery cartridge leaking or defective caution

Battery shows signs of leakage or does not function

Ranked causes

1. Battery cartridge defective (unknown)

Battery charger voltage out of specification

Battery charger output voltage is outside 9.78–10.00 V range; charger or power supply defective

Ranked causes

1. Battery charger circuit degradation or external power supply failure (occasional)

First check

Measure battery charger output voltage

Test point: Charger output connector
Expected: 9.78 to 10.00 volts, 9.78–10.00 V
Tools: Digital multimeter

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

Battery connection fault

Battery not detected or connection issue

Ranked causes

1. Battery connector disconnected or loose (common)

First check

Check battery connector seated properly on Main PCW

Test point: Battery connector
Expected: Connector fully inserted and secure

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

Battery error patient safety

Battery-related fault or alarm condition

Ranked causes

1. Low battery voltage (common)

First check

Check battery voltage

Test point: Battery terminals
Expected: Nominal voltage for battery type

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

Battery polarity incorrect caution

Battery installed with reversed polarity

Ranked causes

1. Battery installed backward (occasional)

First check

Verify battery polarity matches markings

Test point: Battery compartment
Expected: Positive and negative terminals aligned correctly

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

Battery voltage low or absent

Battery voltage reading below expected level

Ranked causes

1. Battery depleted or defective (common)

First check

Measure battery voltage

Test point: Battery terminals
Expected: Within specification per battery type

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

Cables, connectors, or electrodes physically damaged patient safety

Visual or physical inspection reveals cracks, corrosion, loose connections, frayed wires, or other damage to cables, connectors, or electrode pads

Ranked causes

1. Mechanical wear, environmental exposure, or manufacturing defect (common)

First check

Visual and tactile inspection of cables, connectors, electrodes

Test point: Entire cable assembly and electrode pads
Expected: No visible cracks, corrosion, fraying, or loose connections

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

Calibration: Battery resistance check

Measure resistance of negative battery terminal to verify battery condition and connector integrity

Ranked causes

1. Excessive battery or connector resistance (unknown)

First check

Measure resistance from negative battery terminal to Sternum Output Pin 1

Test point: negative battery terminal to Pin 1 (patient connector)
Expected: less than 8 Ω, < 8 Ω
Tools: DMM

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

Calibration: Defibrillation output energy measurement high voltage

Measure defibrillation output energy using LIFEPAK energy meter connected to analyzer

Ranked causes

1. AED must be in Clinical mode for defibrillation measurement (common)

First check

Place AED in Clinical mode

Test point: AED control panel
Expected: AED in Clinical mode

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

Calibration: Energy output patient safety

Verification that the defibrillator energy output meets specified performance within acceptable tolerance

Ranked causes

1. Energy calibration required (unknown)

First check

Set defibrillation analysis mode to ENERGY

Test point: ENERGY selection
Expected: @??? t 1range

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

Calibration: ESD test verification caution

Electrostatic discharge test procedure for LIFEPAK 500 using ESD10 device per IEC 61000-4-2 standard

Ranked causes

1. ESD immunity verification required (unknown)

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

Calibration: LCD contrast adjustment

Adjustment procedure to set LCD contrast on LIFEPAK 500 AED to optimal display level

Ranked causes

1. LCD contrast requires calibration (unknown)

First check

Access ADJUST LCD CONTRAST screen

Test point: Service menu
Expected: ADJUST LCD CONTRAST screen displays

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

Calibration: LIFEPAK 500 boot test patient safety

Procedure to verify LIFEPAK 500 boots correctly into CONNECT ELECTRODES state after completing TimeOut/Max Battery Recovery procedure

Ranked causes

1. TimeOut/Max Battery Recovery procedure completion (common)

First check

Insert insulated shunter cable between TR+XX and TR-abb as shown at the left

Test point: TR+XX and TR-abb
Expected: Insulated shunter cable connected

5 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Calibration: LIFEPAK 500 defibrillator analysis function patient safety

Verify ANALYZE button and menu functions for proper operation and device response

Ranked causes

1. Device ANALYZE function requires calibration verification (unknown)

First check

Power on device in HEART mode

Test point: Power switch
Expected: Device boots to HEART mode

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

Calibration: Oscilloscope defibrillation output high voltage

Set oscilloscope to measure defibrillation energy output with correct settings and energy meter baseline

Ranked causes

1. Oscilloscope requires proper configuration for energy measurement (common)

First check

Connect oscilloscope to defibrillation analyzer scope output

Test point: scope output connection
Expected: oscilloscope connected

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

Calibration: Performance inspection patient safety

Computer-assisted automated tests for LIFEPAK 500 defibrillator including serial communications, battery sense, slow charge rate, 9 V monitor, motion detection, and PPE self-test functions

Ranked causes

1. Calibration procedure execution (common)

First check

Serial port communication

Test point: COM1 or COM2
Expected: Unit under test connected to selected serial port

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

Calibration: Performance Inspection Procedure patient safety

Verification of LIFEPAK 500 defibrillator performance by measuring defibrillator impedance readings against specified tolerances using a decade resistance box and VPK-100 test adaptor.

Ranked causes

1. Routine calibration and performance verification (common)

First check

Press ANALYZE button to initiate impedance measurement

Test point: ANALYZE button
Expected: Initiate Part A impedance test

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

Calibration: Performance Inspection Procedure - Fail condition patient safety

Action required when impedance measurements are outside specified tolerances.

Ranked causes

1. Impedance measurement outside tolerance (rare)

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

Calibration: remaining energy levels patient safety

Verify remaining energy levels on display are within acceptable output ranges for monophasic and biphasic LIFEPAK 500 defibrillators

Ranked causes

1. Energy level output verification required (unknown)

First check

Verify monophasic AED remaining energy output

Test point: LIFEPAK 500 Monophasic AED display
Expected: 200 ± and 360 ±

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

Computer assisted tests fail caution

AED fails computer-assisted diagnostic tests in Service Mode

Ranked causes

1. Internal fault in tested circuit or software error (occasional)

First check

Execute computer-assisted test suite in Service Mode

Test point: Service Mode test menu
Expected: All computer-assisted tests pass without errors

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

Computer-assisted tests failed

AED does not pass computer-assisted diagnostic tests; internal system fault detected

Ranked causes

1. Microprocessor, memory, or internal system fault (unknown)

First check

Run computer-assisted diagnostic test suite

Test point: AED microprocessor and internal circuits
Expected: All computer-assisted tests pass

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

Data or memory issue

Device memory or stored data error

Ranked causes

1. Data corruption in memory (rare)

First check

Test memory integrity

Test point: Device memory
Expected: No error codes or CRC failures

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

Data save not completed patient safety

Device powers up but data save operation did not complete

Ranked causes

1. Data save operation failed (unknown)

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

Date or time incorrect

AED internal clock displays wrong date or time after self-test

Ranked causes

1. Battery-backed real-time clock failure or user error during setup (occasional)

First check

Verify time and date display

Test point: AED display after self-test
Expected: Current date and time displayed correctly

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

Device selected to wrong mode patient safety

Unit operating in incorrect mode or configuration

Ranked causes

1. Mode switch set incorrectly (common)

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

Electrode impedance test failure

AED does not respond properly to electrode impedance measurement tests; may indicate electrode or sensing circuit defect

Ranked causes

1. Defective electrodes or impedance sensing circuit (unknown)

First check

Verify electrode impedance test response

Test point: Electrode connectors
Expected: AED properly responds to impedance tests

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

Energy output out of specification patient safety

Actual delivered energy does not match nominal specification or tolerance range for any shock energy level

Ranked causes

1. High-voltage supply, charging circuit, or capacitor degradation (unknown)

First check

Measure shock energy at each level

Test point: Defibrillator analyzer input
Expected: Monophasic: 200 J (190–210), 300 J (285–315), 360 J (342–378); Biphasic: 100 J (95–105), 360 J (342–378)

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

Error message or alarm code displayed patient safety

Device displays error or alarm notification to operator

Ranked causes

1. Internal device error or alarm condition (unknown)

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

Fault code does not clear after restart patient safety

Fault code persists in Fault Code Log after shutdown and restart of the AED, indicating possible permanent hardware error or recurring transient interference.

Ranked causes

1. Permanent hardware failure (rare)

First check

Verify fault code persists after two restart cycles

Test point: Fault Code Log
Expected: Same fault code recorded after restart; does not clear

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

Improved power on sequence

Device powers on in unexpected sequence or manner

Ranked causes

1. Dime-of-Way clock battery defect (rare)

First check

Verify Main PCW installation and operation

Test point: Main PCW
Expected: PCW installed and functioning properly

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

Incorrect time or date display caution

AED displays wrong time and date values

Ranked causes

1. Real-time clock battery depleted or circuit failure (occasional)

First check

Verify displayed time and date are correct

Test point: AED display screen
Expected: Time and date match current values

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

Keyboard does not respond caution

AED fails to enter Service Mode when keyboard is tested

Ranked causes

1. Keyboard membrane or circuit failure (occasional)

First check

Attempt keyboard test in Service Mode

Test point: Keyboard input
Expected: AED successfully enters Service Mode

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

Keypad test failed

Keypad does not respond to input or shows error during test

Ranked causes

1. Key switch caps loose or damaged (occasional)

First check

Verify keypad overlay is properly installed

Test point: Top cover keypad area
Expected: Cover properly installed and secure

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

Leakage current exceeds limit high voltage

Lead-to-lead leakage current exceeds 9 µA; electrical safety hazard to patient or operator

Ranked causes

1. Insulation breakdown or contamination on PCB or connectors (rare)

First check

Measure lead-to-lead leakage current

Test point: Electrode connectors or internal test points
Expected: Leakage current ≤9 µA, ≤9 µA
Tools: Medical-grade leakage current meter

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

Main CPU error

Main CPU fault code detected during self-test

Ranked causes

1. Defective Main CPU (rare)

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

Pad or electrode issue patient safety

Problem with defibrillator pads or electrodes

Ranked causes

1. Pads expired or defective (common)

First check

Verify pad expiration date

Test point: Pad package
Expected: Current date before expiration

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

Performance Inspection patient safety

Verify LIFEPAK 500 AED functions correctly through systematic checks of power, indicators, and button operation

Ranked causes

1. Unit requires periodic performance verification (common)

First check

Power on the LIFEPAK 500 AED

Test point: ON/OFF pad
Expected: Unit powers on

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

More symptoms

Power-on sequence incomplete
Review fault codes on display
Serial number mismatch
Service Mode entry failed
Shock counter display review
Test equipment verification
Unit displays ANALYZING NOW—STAND CLEAR
Unit displays ANALYZING NOW—STAND CLEAR—NO SHOCK ADVISED—CHECK FOR PULSE
Unit displays CONNECT ELECTRODES
Unit displays fault code
Unit marked as out of use
Yellow operating system light on

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

Error codes

Code	Meaning	Trigger	Severity
`**??`	CPU data save volume error	CPU unable to access data volume	error
**?`	CPU measured clock input out of range	Clock frequency outside specification	error
`**?@`	CPU SV voltage check failed	Voltage measurement out of range during test	error
`**?>`	CPU clock usage flag not organized	Clock memory structure corrupted	error
`**?^`	CPU symbol stored flag high (repeated)	Symbol storage flag remains set	warning
`**?]`	CPU symbol two stored flag high (repeated)	Secondary symbol flag remains set	warning
`**?a`	CPU symbol two stored flag high	Secondary symbol flag set abnormally	warning
`**?b`	CPU symbol stored flag high	Symbol storage flag set incorrectly	warning
`Battery Low Battery`	Battery voltage is low but unit may still operate	Battery voltage drops below normal operating level	warning
`Battery Out of Service`	Battery is no longer usable or not installed	Battery voltage below threshold or expired battery detected	error
`CCC 1`	Corrective action code indicating first fault route	Primary fault detection	unknown
`CCC 2`	Corrective action code indicating second fault route	Primary fault persists after first remedy	unknown
`D>?@`	Data save memory read error	Device unable to read from data save memory	error
`D>??`	Data save mount volume error	Device unable to access data save location	error
D>?`	RAM or long-term battery discrepancy	Mismatch between RAM and backup battery status	error
`**?d`	CPU measured alert input out of range	Alert signal voltage abnormal	error
`Data CRC Data Corrupted Data`	Data integrity check failed; memory corruption detected	Device detects checksum mismatch in stored data	error
`DDMMMYY HH:MM`	Fault code with date and time stamp	When fault codes are present in device memory	unknown
`E-.`	Data memory test zero battery malfunction	Battery test failure	error
`E-$`	Data memory test zero zero battery malfunction	Battery test failure	error
`E-^??`	Control circuit power mismatch	Control board voltage regulation out of specification	error
`E-0@.`	System waveform shape error	Output waveform deviates from specified shape	error
`E-0@]`	Device low power, system status condition	Battery or power supply below operating threshold	warning
`E-0@$`	Device queue buffer overrun	Data buffer overflow condition	warning
`E-0@^`	System low amplitude error	Output signal amplitude below specification	error
`E-0@]`	System telemetry function error	Data transmission or telemetry subsystem failure	error
`E-01`	Loose or incorrect pad application	Pad sensor detects abnormal impedance or contact	error
`E-01`	Connector, battery contacts defective	Battery contact or connector failure detected	error
`E-02`	Battery signal data corrupted	Battery data reading error	error
`E-02`	Loose or incorrect connector	Electrode connector not fully seated or damaged	error
`E-03`	Loose skin electrode, mode	Electrode contact lost during operation	warning
`E-04`	Battery rigging to internal power data	Battery rigging configuration error	error
`E-04`	Loose skin electrode, missing AED connector	Electrode signal intermittent or absent	error
`E-05`	Loose skeletal, to-I, mode	Skeletal muscle artifact or motion detected	warning
`E-06`	Loose heart, mode, off, more, or on	Electrode or lead contact problem during operation	error
`E-07`	Loose heart, mode, all 1 st, on or off	Intermittent electrode signal during defibrillation	error
`E-08`	Loose heart, receive	Electrode contact lost during analysis phase	error
`E-09`	Loose E15, do-I, receive, mode	E15 sensor or lead contact intermittent	warning
`E-0@a`	System address error	Memory or communication address fault detected	error
`E-0@b`	Device high power, system status condition	Battery or power supply above normal operating threshold	warning
`E-0@E`	System configuration power mismatch	Configuration does not match actual power supply	error
`E-1`	Unit will not load or power on	Device fails to power up	critical
`E-1`	AED not ready—test abortion detected	Self-test failure	critical
`E-10`	Loose R15#, mode registered on subsystem	R15# sensor reporting abnormal state	warning
`E-10`	Control invalid (I/O E15, I14, HE)	Control processing error detected	error
`E-10`	Communication test defibrillator missing success	Unit fails communication diagnostic test	error
`E101`	E15 chip malfunction	Chip hardware failure	critical
`E102`	E15 chip not ready	Chip initialization failure	critical
`E103`	E15 chip sample timeout not stored	Timeout during sampling	error
`E104`	E15 chip queue full error	Queue overflow	error
`E105`	E15 chip shutdown data corrupted	Data corruption on shutdown	critical
`E106`	Control circuit current short detected anchor	Short circuit detected	critical
`E107`	Control circuit current short leads condition	Short circuit on leads	error
`E108`	Control circuit current short energy status	Energy circuit short	critical
`E-11`	Loose display, reset, mode	Display firmware or state error	warning
`E-11`	Startup ROM test failed, ROM not masked	ROM integrity check failure during startup	critical
`E-11`	Communication Y defibrillator missing success	Y-channel communication failure	error
`E-12`	Communication test X defibrillator missing success	X-channel communication failure	error
`E-12`	Control invalid, startup data error, data category mismatch	Startup configuration data error	error
`E-12`	Loose axon motor, bank, subsystem, mode	Motor control or feedback error	error
`E-13`	Anomaly in ROM test expired	ROM anomaly detection during test sequence	error
`E-13`	Communication Y X defibrillator missing success	Dual-channel communication failure	error
`E-13`	Loose extension, to-I, bank, subsystem, mode	Extension module connection or control error	warning
`E-14`	Control invalid, EEPROM abort object, ROM test expired	EEPROM or ROM integrity failure	critical
`E-14`	Loose bus, bank, subsystem, mode	Internal bus communication error	error
`E-14`	Communication test band error	Band frequency communication error detected	error
`E-15`	Communication Y band error	Y-band communication frequency error	error
`E-15`	Startup ROM anomaly offset, EEPROM not masked	ROM offset or EEPROM integrity issue during startup	error
`E-15`	Loose monitor, E15, bank, subsystem, mode	Monitor module or E15 interface malfunction	error
`E-16`	Loose electro, bank, subsystem, mode	Electrocardiogram processing error	error
`E-16`	Mohawk band HIS band error at test complex malfunction	HIS band frequency or modulation error	error
`E-16`	Startup sensor support, EEPROM not masked	Sensor configuration or EEPROM error at startup	error
`E-17`	Mohawk HIS complex at Y complex malfunction	HIS-Y complex signal integrity failure	error
`E-17`	Loose control, and, bank, subsystem, mode	Control system error or interface failure	error
`E-17`	Startup output signal, data flowfield, ROM not masked	Output signal or data flow error at startup	error
`E-18`	Loose non, bank, subsystem, mode	Non-standard or undefined subsystem error	warning
`E-18`	Startup clock check, ROM not masked	Clock circuit or ROM integrity failure	error
`E-18`	Check Fuses	Fuse integrity diagnostic failure	warning
`E-19`	Startup CPU, ROM not masked	CPU initialization or ROM failure	critical
`E-19`	Check the Battery	Battery diagnostic test failed	warning
`E-1b??`	Analog low voltage malfunction	Analog circuit supply voltage below minimum threshold	critical
`E-1b?@`	Non-rank waveform absent	Expected waveform signal not detected on reference channel	warning
`E-1d?@`	EEPROM memory not initialized	System detects uninitialized EEPROM on startup	error
E-1d?`	EEPROM code download failed	Firmware upload to EEPROM does not complete successfully	error
`E-1d??`	EEPROM communication checksum failure	Data read from EEPROM fails checksum validation	error
`E-1d?d`	EEPROM communications bad packet detected	Received data packet fails integrity check	error
`E-1d?Z`	EEPROM no data received from timeout	EEPROM communication times out waiting for data	error
`E-2`	Unit will not charge or battery low	Battery charging failure detected	error
`E-20`	Startup EEPROM, ROM not masked	EEPROM access or ROM integrity failure	critical
`E-20`	Replace battery Time Mask Clock Battery	Clock or backup battery depleted	warning
`E-21`	Startup input abort, ROM not masked	Input circuit or ROM failure at startup	error
`E-22`	Startup input anomaly, ROM not masked	Input anomaly detection during startup	error
`E-23`	Startup output abort, ROM not masked	Output circuit or ROM failure at startup	error
`E-24`	Startup input abort, EEPROM, ROM not masked	Input circuit, EEPROM, or ROM failure	critical
`E-25`	Startup ROM anomaly, ROM not masked	ROM anomaly detected at startup	error
`E-3`	Battery is damaged or will not hold charge	Battery fails to maintain charge	error
`E-3`	AED not ready—dump memory error	Memory dump failed	critical
`E-4`	AED not ready—data memory error	Memory corruption	critical
`E-4`	User pads, electrodes, energy output unable to discharge	Defibrillation output failure	critical
`E-5`	AED not ready—memory directory system error	Directory system failure	critical
`E-5`	User pads, therapy button will not discharge	Therapy button fails to trigger discharge	error
`E-6`	AED not ready—memory data mismatch error	Data integrity check failed	critical
`E-6`	User pads, data will not discharge	Data transmission failure during discharge	warning
`E-7`	AED not ready—memory directory system error	Directory malfunction	critical
`E-7`	User pads, therapy button will not discharge will not discharge	Repeated therapy button discharge failure	error
`E-8`	User pads, capacitor malfunction	Capacitor charging or holding failure	error
`E-9`	Decomfibrillator ECG incomplete at ECG complex malfunction	ECG signal acquisition or analysis failure	error
`E-^?d`	Control board signal update timeout	Control signal update cycle exceeds timeout threshold	warning
`EE-01`	Self-test failed too many times	Multiple consecutive self-test failures	critical
`EE-02`	Self-test abort not insured	Abort safety mechanism failure during self-test	critical
`EE-03`	Self-test runtime asserts	Runtime assertion detected during self-test	error
`EE-04`	Non-volatile dropped lead dead message	Lead-off signal loss during operation	error
`EE-05`	Non-volatile dropped low battery message	Battery voltage drops unexpectedly	error
`EE-06`	Non-volatile battery not continual	Battery continuity check failure	error
`EE-07`	Incorrect file of waveform data type	Waveform data format error detected	warning
`EE-08`	Configuration of battery used out of order function message	Battery configuration mismatch detected	error
`EE-09`	Non-verbose dropped lead dead message	Lead-off detection during normal operation	warning
`EE-10`	Control voltage jumps startup switch might	Control voltage fluctuation at startup	error
`EE-11`	Control battery high voltage	Battery voltage exceeds safe range	critical
`E-^?Z`	Control board signal output lead status timeout	Control output signal fails to reach expected state	error
`Fault codes stored in Fault Code Log`	AED has detected and recorded one or more internal faults during self-test or operation	Internal self-test program execution or routine AED operation	warning
`Pad Battery Out of Service Pad Battery`	Defibrillator pads are expired or non-functional	Pads beyond expiration date or connection failure	error
`S??`	Unit data save volume error	Data volume access failure	error
`Sensor Reset Energy`	Sensor or energy measurement system error	Device cannot measure or reset energy-related sensors	error
`System FPGA Firmware Voltage Reference`	Internal system, FPGA, firmware, or voltage reference failure	Self-test detects failure in core system component	critical
`**?Z`	CPU measured pump input out of range	Pump drive signal abnormal	error

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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.