P4
Klimaire
Inverter Module Overheat / IPM Temperature Protection
Indoor unit shows P4 and the system may not operate.
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Safety Warning
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.
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Possible Causes
Blocked airflow around outdoor unit, Dirty heat sink on inverter module, Failed inverter cooling fan (if equipped), Degraded thermal paste between IPM and heat sink
How to Fix / Troubleshooting
Safety first: Disconnect power before opening the outdoor unit.
- Step 1 – Ensure ventilation: Confirm the outdoor unit has adequate clearance and is not enclosed.
- Step 2 – Clean heat sink area: Remove the outdoor PCB cover and gently blow out dust from the inverter heat sink and surrounding area.
- Step 3 – Check any auxiliary fans: If your model uses a dedicated electronics cooling fan, verify it operates when the compressor runs.
- Step 4 – Professional service: If P4 recurs, a technician may need to reapply thermal compound or replace the inverter board.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter Power Board / Heat Sink Assembly
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