H4 code; indoor unit may not respond or may shut down

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

Indoor fan motor jammed by debris, Failed indoor DC fan motor, Faulty indoor fan driver circuit on PCB, Loose fan motor connector

Safety first: Disconnect power before opening the indoor unit.

Remove obstructions: Check the blower wheel for foreign objects or heavy dust buildup and clean thoroughly.
Check motor connector: Ensure the fan motor plug is fully inserted into the indoor PCB.
Manual spin test: Rotate the blower by hand; if stiff, the motor bearings may be seized.
Replace motor if needed: If H4 persists and the fan does not start, replace the indoor fan motor assembly.

After replacement, clear the error by power cycling.

Medium 3/5

Indoor Fan Motor

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