Defibrillator monitors · CodeMaster family

Hewlett-Packard CodeMaster XL: troubleshooting and error codes

The ServiceForge knowledge base holds 17 documented symptoms for the Hewlett-Packard CodeMaster XL, with 24 ranked causes, 71 diagnostic checks with test points and expected values, and 3 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

SpO2 measurement failure patient safety

Pulse oximetry function not operating or reading shows error condition

Ranked causes

1. SpO2 sensor disconnected (common)
2. SpO2 cable disconnected (common)
3. Noisy signal from SpO2 sensor (occasional)
4. Light interference with SpO2 measurement (occasional)
5. Low signal strength from SpO2 sensor (occasional)

First check

Verify SpO2 sensor connection

Test point: Sensor connector
Expected: Secure connection to monitor

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

No battery installed or not recognized

Battery absent, removed, or device does not recognize battery presence

Ranked causes

1. Battery not installed (common)
2. Device does not recognize battery (rare)

First check

Verify battery is inserted

Test point: Battery compartment
Expected: Battery fully seated and latched

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

SpO2 reading outside normal range patient safety

SpO2 reading significantly below 95% on healthy subject indicates sensor or monitor malfunction

Ranked causes

1. Faulty SpO2 sensor or poor contact (common)
2. SpO2 PCA internal fault detected during self-test (occasional)

First check

Verify SpO2 sensor contact on subject

Test point: Sensor attachment site
Expected: Sensor firmly applied per manufacturer packaging instructions; adequate blood perfusion at attachment site

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

Unable to verify defibrillator operation patient safety

Failure to confirm proper functioning after repair or suspected malfunction; requires diagnostic testing

Ranked causes

1. Defibrillator not verified after repair (common)
2. Battery charge capacity reduced (occasional)

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

AC power connected message

Unit displays notification that AC power is connected

Ranked causes

1. AC power cable connected to unit (common)

First check

Verify AC power connection status

Test point: Power cord and wall outlet
Expected: AC power disconnected

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

Battery charger voltage check

Verification of AC/DC converter and battery charger output voltage during diagnostic test

Ranked causes

1. AC/DC converter or battery charger fault (rare)

First check

Measure battery charger output voltage

Test point: Diagnostic test screen VOLTAGE NOW readout
Expected: 13.6V, ±0.6V
Tools: Diagnostic menu TEST BATTERY

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

Calibration: Defibrillator capacitance high voltage

Routine measurement and adjustment of HV capacitor capacitance to ensure accurate energy delivery. Performed after servicing, HV capacitor replacement, Control board replacement, unit opening, or scheduled preventive maintenance.

Ranked causes

1. Capacitance drift or unknown after service (common)

First check

Connect external paddles and place firmly in holders

Test point: Defibrillator paddle receptacles
Expected: Paddles seated securely

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

Calibration: Defibrillator performance verification high voltage

Complete performance verification including defibrillator output, ECG function, safety compliance, and auxiliary systems via setup/diagnostic menu tests

Ranked causes

1. Routine calibration and performance verification required (common)

First check

Verify SpO2 sensor attachment and connection

Test point: SpO2 sensor connector
Expected: Sensor firmly attached to healthy person; plugged into defibrillator or M1900B adaptor

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

Defibrillator calibration failed patient safety

Error log shows failed calibration; defibrillator functions but energy levels may be inaccurate

Ranked causes

1. Previous calibration failed (common)

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

Defibrillator calibration status unknown patient safety

Error log indicates defibrillator not calibrated or calibration value lost; device uses nominal values

Ranked causes

1. Calibration not performed or value lost (common)

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

Defibrillator failure high voltage

Defibrillation function not operating or not delivering energy to patient

Ranked causes

1. High voltage energy delivery system fault (rare)

First check

Test defibrillation output capability

Test point: Defibrillator pads/paddles
Expected: Energy delivered to test load at selected energy level

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

No pads detected patient safety

Device indicates pads are not attached or recognized during defibrillation setup

Ranked causes

1. Pads not attached to patient (common)

First check

Verify pads are physically attached to patient

Test point: Patient chest
Expected: Pads visibly in contact with skin

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

Pacemaker failure patient safety

Pacing function not working or not delivering output as expected

Ranked causes

1. Pacemaker malfunction (rare)

First check

Assess pacer output and patient response

Test point: Monitor display
Expected: Pacer output visible on ECG with mechanical capture

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

Power supply voltage test high voltage

Verification and measurement of DC supply voltages from internal power supply

Ranked causes

1. Power supply malfunction (rare)

First check

Measure +4.3V supply

Test point: Control board connector J12, pin 27
Expected: +4.3V, ±0.4V
Tools: DMM

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

TEST 100J failed high voltage

Energy delivery system test at 100 joules did not meet requirements

Ranked causes

1. Energy delivery system fault (rare)

First check

Verify energy delivery at 100J setting

Test point: Defibrillator output
Expected: 100J delivered within specified tolerance

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

Test: Defibrillator performance high voltage

Verification of defibrillator output performance including energy delivery, charge time, disarm time, impedance, and peak current. Run after calibration and in both battery-only and AC-only power configurations.

Ranked causes

1. Routine performance verification required (common)

First check

Prepare battery-only power configuration

Test point: Power source connections
Expected: Battery installed and fully charged; defibrillator disconnected from AC power

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

Visual inspection before performance verification caution

Examination of defibrillator and accessories for damage, wear, and operational readiness before calibration and testing procedures.

Ranked causes

1. Preventive maintenance and safety check required (common)

First check

Turn Energy Select control to Off (Standby)

Test point: Energy Select control
Expected: Control at Off/Standby position

11 more checks 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
`BAD USAGE: SEE MANUAL`	Energy Select control set below 300 joules during calibration routine	User sets Energy Select control to value below 300 joules while CALIBRATE DEFIB routine is running	warning
`CALIBRATION FAILED`	Defibrillator capacitance calibration routine did not complete successfully	Error occurs during CALIBRATE DEFIB routine execution	error
`SETUP LOST`	Defibrillator configuration settings have been lost or cleared	Configuration parameters lost from battery-maintained memory; may occur due to battery failure or memory corruption	error

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

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

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