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What This Guide Helps With
Troubleshooting Error 900b when LIFEPAK 20 / 20e pacing rate is outside tolerance, potentially affecting reliable pacing therapy.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
- Remove the LIFEPAK 20 / 20e from patient use if Error 900b is active, recurring, or discovered during operational testing.
- If pacing or defibrillation capability is clinically needed, provide staff with another verified defibrillator before continuing.
- Do not troubleshoot while the device is connected to or relied upon for an active patient.
Expected: Patient care is transferred to a known-good device.
Why it matters: An out-of-tolerance pacing rate may affect the timing and reliability of pacing therapy.
2. Verify the Reported Error and Behavior
Confirm the exact Service Log error:
- Error 900b
- Pacing rate outside tolerance
Determine when the condition occurs:
- At startup
- During self-test or inspection
- When pacing mode is selected
- During controlled pacing performance testing
- Intermittently during operation
Note associated behavior such as:
- Incorrect measured pacing rate
- Pacing unavailable or unreliable
- Service indication
- Failed performance inspection
Expected: Error 900b is clearly confirmed in the Service Log or associated with reproducible pacing performance failure.
Why it matters: Confirms a true system-reported pacing fault rather than an operator setup issue.
3. Check Power and Basic External Conditions
Before assuming an internal device failure:
- Verify the device has a stable AC power source when appropriate.
- Confirm the battery is installed correctly and adequately charged.
- Inspect the AC power cord and external connections for visible damage.
- Power-cycle the unit only in a controlled, non-patient environment.
Expected: The error does not result from unstable power, a loose external connection, or a transient startup condition.
Why it matters: Basic external conditions should be ruled out before escalating to internal corrective action.
4. Inspect Pacing Accessories and Connections
In a controlled test environment:
- Inspect the therapy cable for visible damage, contamination, or poor connector seating.
- Verify compatible pacing electrodes or the approved test setup are being used.
- Confirm connectors are fully seated.
- Substitute a known-good compatible therapy cable or test accessory when available.
Expected: External pacing accessories are intact and do not explain the fault.
Why it matters: Damaged accessories can produce pacing-related symptoms, but they should not be confused with a confirmed internal pacing-rate tolerance error.
5. Verify Pacing Configuration and Test Setup
Confirm:
- The selected pacing rate is intentional.
- Test equipment is properly configured.
- The analyzer or pacing test load is compatible and functioning correctly.
- No unusual configuration or setup error is affecting the observed measurement.
Repeat the pacing check under controlled conditions.
Expected: The measured pacing-rate problem remains despite a verified setup.
Why it matters: This isolates the fault from configuration or test-equipment error.
6. Isolate the Failure
At this point, determine whether the condition is:
- Accessory-related
- Configuration-related
- Environmental
- Device-related
If known-good accessories, stable power, and correct test configuration do not resolve Error 900b, treat the condition as an internal device fault.
Expected: External and readily verifiable causes have been ruled out.
7. Follow the Corrective Action Path
For persistent Error 900b, the manual corrective action is replacement of the A01 System PCB.
This is a qualified service repair and should not be treated as routine external troubleshooting.
After corrective action:
- Complete required post-repair inspection procedures.
- Verify pacing rate performance with appropriate test equipment.
- Confirm pacing functionality across required settings.
- Confirm the error does not recur.
- Complete applicable performance inspection requirements before release.
Expected: Pacing rate remains within specification and the device passes all required testing.
Why it matters: PCB replacement alone is not sufficient justification for return to clinical service; therapy performance must be verified.
8. Stop When Resolved
If the issue is corrected and the LIFEPAK 20 / 20e:
- No longer logs Error 900b
- Produces pacing rate within specification
- Passes required pacing performance testing
- Passes applicable post-repair inspection
Document the work and return the device to service according to facility policy.
If the Problem Persists
If Error 900b remains after external causes have been ruled out, the condition strongly indicates an internal device failure.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for qualified bench evaluation or repair
- Escalated according to the manufacturer-supported corrective action path
Do not return the LIFEPAK 20 / 20e to clinical use with unresolved pacing-rate performance concerns.
Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Never troubleshoot on an active patient. Move the patient to a backup verified device first and maintain therapy continuity before evaluating an active pacing-rate fault.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"LIFEPAK 20 / 20e reported Service Log Error 900b, indicating pacing rate outside tolerance. Pacing performance required evaluation before return to service."
Cause
What was observed during troubleshooting.
Example:
"Verified Error 900b under controlled testing. Power source, therapy accessories, connections, pacing configuration, and test setup were checked without resolving the condition, indicating likely internal system fault requiring A01 System PCB corrective action."
Resolution
What action was taken.
Example:
"Removed defibrillator from clinical service and labeled Out of Service for qualified repair. A01 System PCB corrective action initiated per service guidance. Pacing performance and required post-repair inspection must pass before return to use."
Helpful Details to Include (If Known)
- Alarm behavior, including whether Error 900b occurred at startup, during pacing, or intermittently
- Accessories swapped, including known-good therapy cable or test accessory substitution
- Power behavior, including AC outlet and battery condition
- Environmental factors present when the error occurred
- Indicator lights or Service indicator behavior
- Selected pacing rate and actual measured pacing rate
- Analyzer or test-load setup
- Whether the A01 System PCB was replaced
- Post-repair pacing test results
- Final device status
Final Thought
Error 900b should be treated as a genuine pacing-performance fault, not simply cleared and ignored. Patient safety comes first, external causes should be ruled out logically, and persistent failure requires appropriate internal repair escalation. Accurate CCR documentation preserves the error context, test findings, corrective action, and final disposition.
That is successful troubleshooting.