What It Means
PCM 5V DC power supply to VFD interrupted or out of range.
Carrier Heat Pump
Carrier Heat Pump Error Code 24-58
Troubleshooting guide for the Carrier Heat Pump system fault 24-58.
Possible Causes
- Internal PCM 5V power supply failure.
- Damaged wiring harness between PCM and VFD.
- Short circuit on 5V DC control bus.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
5V PCM Power Out of Range Lockout. PCM 5V DC supplied to VFD is interrupted or out of range, shutting the system down if not restored.
All Recorded Causes
Check PCM power supply for proper 5V DC output. Inspect wiring between PCM and VFD for damage. Measure 5V DC bus voltage with a meter. Replace PCM if internal power supply is faulty.
Verify Before Replacing Parts
- Confirm the exact Carrier model family and heat pumps context before acting on a generic code description.
- Start with line voltage, low voltage, and board output checks in sequence so the fault is isolated cleanly — the data plate flags check PCM power supply for proper 5V DC output.
- Inspect connectors, relay outputs, and any recently replaced electrical parts for mismatch or loose fit, and verify inspect wiring between PCM and VFD for damage.
- After the correction, run the system long enough to confirm the heat pumps fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Carrier Heat Pump diagnostics step-by-step — so you confirm the cause before swapping parts.
