What It Means
Missing model plug with no stored configuration in PCM memory.
Carrier Heat Pump
Carrier Heat Pump Error Code 25-62
Troubleshooting guide for the Carrier Heat Pump system fault 25-62.
Possible Causes
- Missing model plug on PCM control board.
- Incorrect or unseated model plug.
- Unconfigured PCM memory requiring model plug installation.
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
Model Plug Missing Lockout. Valid model plug was not present when power was applied and there is no valid value stored in PCM memory; equipment will not operate.
All Recorded Causes
Install the correct model plug for this unit on the PCM before applying power. Verify model plug part number matches the unit model. Equipment cannot operate until valid model plug is installed.
Verify Before Replacing Parts
- Confirm the exact Carrier model family and heat pumps context before acting on a generic code description.
- Verify current draw, overload status, and control signal before condemning the compressor or drive, given that install the correct model plug for this unit on the PCM before applying power.
- Look for upstream conditions such as airflow or charge issues that may be pushing the compressor into protection, and check verify model plug part number matches the unit model.
- 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.
