Keeprite Inverter Module Overheat / IPM Protection

Keeprite inverter system shows P4; compressor may not run.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Blocked airflow through outdoor control compartment, High ambient temperature, Failing inverter module, Poor heat sink contact

Safety first: Turn off power at the disconnect. Inverter components can retain charge.

Step 1 – Clear vents: Ensure the outdoor unit's control compartment vents are not blocked by debris or nests.
Step 2 – Cool-down: Allow the unit to cool for 30–60 minutes, then restart.
Step 3 – Professional service: If P4 recurs, a technician should inspect the inverter heat sink, apply new thermal compound if needed, or replace the inverter module.

Professional Required 5/5

Inverter Control Module

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