Stryker LIFEPAK 35

Defibrillator Will Not Charge

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Asset Type

Defibrillator

Manufacturer

Stryker

Model

LIFEPAK 35

What This Guide Helps With

Troubleshooting failure to initiate or complete defibrillator charging after external power, controls, therapy accessories, configuration, and reproducibility checks.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

Immediately remove the LIFEPAK 35 from patient use if it cannot reliably charge for defibrillation.

Provide clinical staff with another verified defibrillator before troubleshooting continues.

Do not repeatedly test charging while the device is connected to an active patient.

Expected: Patient care continues with a known-good defibrillator.

Why it matters: A device that cannot reliably charge cannot be trusted for time-critical defibrillation therapy.

2. Verify the Exact Reported Failure

Determine what “will not charge” means operationally:

Record the exact wording of any message before cycling power.

Expected: The failure is clearly characterized and reproducible.

If the device charges normally and the complaint cannot be reproduced: Continue controlled functional verification before returning it to service. Do not close the work order solely because one attempt succeeded.

3. Verify the Device Has Stable Power

Check:

When permitted by department procedure, repeat the test using a known-good approved power configuration.

Expected: The LIFEPAK 35 remains powered and stable throughout the attempted charge cycle.

If the issue resolves after correcting the power source or battery connection: Complete required operational testing, document the cause, and stop troubleshooting.

4. Inspect the Therapy Cable and External Therapy Accessories

With the device removed from patient use, inspect the connected therapy pathway for:

Disconnect and reconnect approved reusable accessories as appropriate.

Expected: Therapy accessories are compatible, intact, and fully seated.

If reseating or replacing a defective external accessory resolves the issue: Perform required functional verification, document the finding, and stop.

5. Test With a Known-Good Approved Therapy Accessory

If available and permitted by local procedure, substitute a known-good compatible:

Do not use a patient as a test load.

Expected: The device responds consistently with known-good approved accessories.

If the device charges normally with the substitute accessory: Remove the failed accessory from service and stop troubleshooting the defibrillator itself after completing verification.

6. Verify the Correct Therapy Mode and Energy Selection

Confirm:

Repeat the sequence from a controlled startup condition.

Expected: The LIFEPAK 35 accepts the intended mode and energy selection before charging is initiated.

If correcting the mode or selection resolves the issue: Complete operational verification and stop.

7. Check the CHARGE Control for Consistent Response

Activate the CHARGE control only under controlled bench-test conditions using approved test equipment and departmental procedures.

Observe whether:

Do not repeatedly press or force a damaged control.

Expected: The charge command is recognized consistently.

If the CHARGE control is physically damaged, intermittent, or nonresponsive: Remove the device from service and escalate for bench evaluation.

8. Review Displayed Messages, Service Indicators, and Available Logs

Document any:

If your Clinical Engineering program has authorized access to diagnostic or service information, review available records without clearing evidence prematurely.

Expected: Any associated fault information is preserved for diagnosis.

If a recurring therapy-system or high-voltage-related fault is identified: Stop external troubleshooting and escalate.

9. Perform One Controlled Power Restart

After documenting all visible messages and confirming the device is not connected to a patient:

Expected: The device starts normally and charging behavior is repeatable.

If the issue resolves only temporarily and later recurs: Treat the fault as unresolved. Intermittent charge failure is not acceptable for return to clinical service.

10. Perform Controlled Functional Verification

Using approved defibrillator test equipment and your organization’s authorized inspection procedure, determine whether the unit:

Do not improvise energy-delivery testing and do not perform internal high-voltage measurements as part of basic troubleshooting.

Expected: Charging is reliable and repeatable under controlled test conditions.

If charging remains failed, delayed, intermittent, or abnormal: Stop troubleshooting and escalate.

If the Problem Persists

If power sources, batteries, external connections, therapy accessories, operating mode, energy selection, charge-command response, and controlled external testing have been ruled out, the failure is likely beyond basic external troubleshooting.

The device should be:

Further evaluation may involve the therapy system, charge-control pathway, high-voltage circuitry, internal power distribution, control electronics, or another internal fault. These areas should not be assumed defective until external causes are ruled out, and they should not be investigated through casual internal disassembly.

Knowing when to stop is proper troubleshooting. A defibrillator with an unresolved or intermittent charge failure should not be returned to clinical use.

Clinical Use Tip

Never troubleshoot a charge failure while the LIFEPAK 35 is being relied upon for an active patient. Transfer care to another verified defibrillator first.

A unit that charges successfully once after previously failing is not automatically safe to return to service. Intermittent therapy failures require controlled evaluation and documented verification.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported the Stryker LIFEPAK 35 would not charge after selecting defibrillation energy and initiating the charge command."

Cause

What was observed during troubleshooting.

Example:
"Verified repeatable charge failure with stable device power and known-good external therapy accessories, indicating the fault was not corrected by external troubleshooting."

Resolution

What action was taken.

Example:
"Removed the LIFEPAK 35 from service, labeled it Out of Service, documented the charge failure, and routed the unit for qualified bench repair evaluation."

Helpful Details to Include (If Known)

Final Thought

Defibrillator charge failures require a disciplined safety-first approach. Verify power, connections, external therapy accessories, operating conditions, and reproducibility before suspecting an internal fault. When reliable charging cannot be demonstrated, remove the device from service, escalate appropriately, and preserve clear CCR documentation.

That is successful troubleshooting.

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