Indoor unit shows E25; the unit may not start or may shut down quickly.

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.

Possible Causes

Blocked airflow around the outdoor unit, Failed outdoor fan causing PCB overheating, Poor thermal contact between IPM and heat sink, Faulty temperature sensor on the PCB

How to Fix / Troubleshooting

Safety: Isolate the power before accessing the outdoor PCB.

Steps:

1. Ensure ventilation: Confirm that the outdoor unit has adequate clearance and is not enclosed.
2. Check the outdoor fan: Verify that the fan runs whenever the compressor is commanded on.
3. Inspect the PCB area: With the power off, remove the cover and ensure no insulation or debris is blocking the PCB heat sink.

Technician: May need to reapply thermal compound, replace the PCB temperature sensor, or replace the outdoor PCB if overheating persists.

Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Main PCB

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