Physio-Control LIFEPAK 15

Asset Type

Defibrillator

Manufacturer

Physio-Control

Model

LIFEPAK 15

What This Guide Helps With

This guide helps troubleshoot TH_ERROR_SHOCK_NOT_DELIVERED when the Physio-Control LIFEPAK 15 reports that a shock was not delivered or therapy output may not have occurred. Because this error directly involves defibrillation therapy, it should be treated as a high-priority patient safety issue until the device passes controlled delivered-energy verification.

Step-by-Step Troubleshooting

Ensure Patient Safety First

• Immediately remove the LIFEPAK 15 from patient use if this error occurs during therapy, testing, or operational checkout.
• Use another verified defibrillator for patient care.
• Do not attempt repeated shock delivery on a patient with a device that has reported a shock delivery failure.
• Expected outcome: Patient care continues with a known functional defibrillator.

Verify the Reported Error and Behavior

• Confirm the exact reported error is TH_ERROR_SHOCK_NOT_DELIVERED.
• Confirm whether the associated therapy service code is a00b.
• Document whether the error occurred during manual defibrillation, synchronized cardioversion, AED mode, operational checkout, bench testing, or intermittently after a charge or discharge attempt.
• Look for symptoms such as shock not delivered, charge completed but no discharge occurred, therapy event aborted, service indicator present, therapy service code recorded, unexpected audible tone or message, or failure during defibrillator output verification.
• Expected outcome: The error is reproducible, clearly observed, or confirmed in the service or event log.

Remove the Device From Service

• Do not return the device to clinical use after simply clearing the message or power cycling the unit.
• Label the LIFEPAK 15 as Out of Service.
• Expected outcome: The device is prevented from being used for patient therapy until corrective action and verification are completed.
• Why it matters: A defibrillator that reports shock not delivered cannot be trusted for emergency therapy until delivered-energy performance is verified.

Check External Therapy Setup During Controlled Testing Only

• Perform checks in a controlled bench environment using approved test equipment, not on a patient.
• Inspect the therapy cable connection at the defibrillator.
• Confirm the cable is fully seated, latched, and not loose.
• Expected outcome: The therapy cable is secure with no visible connector damage.

Inspect the Therapy Cable

• Check the therapy cable for cuts, crushed sections, bent pins, loose connector strain relief, contamination, fluid intrusion, burn marks, excessive wear, or intermittent connection when flexed.
• If damage is found, remove the cable from service.
• Retest the defibrillator only with a known-good compatible therapy cable and proper test load.
• Expected outcome: The cable is physically intact and suitable for controlled testing, or the defective accessory is removed from use.

Verify Electrodes or Test Load Setup

• For bench testing, connect the LIFEPAK 15 to an appropriate defibrillator analyzer or approved test load.
• Confirm the correct adapter is used.
• Confirm pads, paddles, or the appropriate therapy adapter are properly connected.
• Confirm the test load is compatible and the analyzer is set up correctly.
• Confirm no loose or open connections are present.
• Expected outcome: The defibrillator sees a valid therapy load during controlled testing.

Check for Accessory-Related Failure

• If facility policy allows, repeat controlled testing using a known-good therapy cable.
• Use known-good pads, paddles, or therapy adapter as applicable.
• Use a known-good defibrillator analyzer or test load connection.
• If the error clears with replacement accessories, remove the failed accessory from service.
• Complete required defibrillator output testing before returning the LIFEPAK 15 to use.
• Expected outcome: The error does not follow a defective cable, adapter, electrode set, or test load setup.

Check Power and Battery Condition

• Verify the unit is connected to a known-good power source or has a known-good charged battery installed.
• Inspect battery contacts and battery seating.
• Watch for power instability during charge and discharge testing.
• Expected outcome: Device power remains stable during controlled charge and discharge testing.

Review Related Service Indicators or Therapy Codes

• Check for additional service indicators, repeated therapy service codes, or related defibrillation and pacing errors.
• Document whether TH_ERROR_SHOCK_NOT_DELIVERED appears alone or with other therapy-related errors.
• Expected outcome: Any related service-code pattern is captured before escalation.

Perform Controlled Defibrillator Output Verification After Corrective Action

• After any accessory correction or repair action, perform required defibrillator delivered-energy testing using approved test equipment and facility procedure.
• Verify that the LIFEPAK 15 can charge properly.
• Verify that the LIFEPAK 15 can disarm properly.
• Verify that the LIFEPAK 15 can deliver shock into the test load.
• Verify that the LIFEPAK 15 records the therapy event correctly.
• Verify that delivered-energy performance requirements are met.
• Expected outcome: Delivered-energy testing passes before the unit is returned to service.
• Do not return the LIFEPAK 15 to service based only on normal startup or absence of the error message.

Stop When Resolved

• If the error is traced to a defective external accessory, remove that accessory from service.
• Complete and pass required operational, therapy, and delivered-energy testing.
• Return the LIFEPAK 15 to service only after the unit passes all required checks.
• Expected outcome: The device is safe, functional, and documented before clinical release.

If the Problem Persists

If TH_ERROR_SHOCK_NOT_DELIVERED remains after external therapy cable, electrode, test load, power, and setup issues are ruled out, treat the condition as an internal therapy delivery failure.

The device should remain removed from service, labeled Out of Service, escalated for repair or manufacturer-level service evaluation, and held from use until corrective action and delivered-energy testing are completed.

Persistent shock-not-delivered errors strongly indicate a device-level therapy subsystem fault. Knowing when to stop is proper troubleshooting.

Clinical Use Tip

Never troubleshoot this error on an active patient. Move the patient to a backup defibrillator first, maintain therapy continuity, and do not rely on a LIFEPAK 15 with an unresolved shock delivery error for emergency therapy, cardioversion, or code response.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"LIFEPAK 15 reported TH_ERROR_SHOCK_NOT_DELIVERED with therapy service code a00b. Staff reported shock was not delivered during therapy attempt or operational checkout."

Cause

What was observed during troubleshooting.

Example:
"External therapy setup was inspected. Therapy cable, electrodes or test load, power source, and controlled test setup were checked. Error indicates shock delivery failure; persistent condition suggests internal therapy subsystem fault if not resolved by accessory correction."

Resolution

What action was taken.

Example:
"Removed LIFEPAK 15 from service and labeled Out of Service. Verified therapy cable, electrode, and test load setup during controlled bench testing. Device escalated for corrective action and defibrillator delivered-energy testing prior to return to service."

Helpful Details to Include (If Known)

• Alarm behavior, including whether TH_ERROR_SHOCK_NOT_DELIVERED appeared during manual defibrillation, synchronized cardioversion, AED mode, operational checkout, or bench testing
• Accessories swapped, including therapy cable, pads, paddles, adapter, analyzer cable, or test load
• Power behavior, including battery condition, battery seating, AC power condition, and whether charging completed before the failure
• Environmental factors, including fluid exposure, contamination, cable strain, recent drops, or storage conditions
• Indicator lights, including service indicator status, therapy service code a00b, and any related therapy service codes
• Final device status, including Out of Service, accessory removed, repair escalation, passed delivered-energy testing, or returned to service

Final Thought

A shock-not-delivered error on a defibrillator is a high-priority patient safety issue. Clinical Engineering should confirm the reported condition, rule out obvious external therapy cable or test setup problems, and avoid assuming the unit is safe just because the message clears. If the error persists, escalation and delivered-energy verification are required before the device can return to patient use.

That is successful troubleshooting.