P4
Daikin Inverter Heat Sink Overheat

Daikin unit shows P4; compressor may not run or may stop

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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 outdoor unit ventilation, Failed outdoor fan, Deteriorated thermal grease on IPM, High ambient temperature

How to Fix / Troubleshooting

Safety first: Turn off power before cleaning or servicing the outdoor unit.

User steps:

  • Ensure the outdoor unit is not enclosed and has proper airflow.
  • Clean the outdoor coil and surrounding area.

Technician tasks:

  • Check outdoor fan operation.
  • Inspect the inverter heat sink and cooling path; replace IPM or reapply thermal compound if required.
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Repair Difficulty

Hard 4/5

Required Part

Outdoor Inverter Module / Heat Sink
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