H5 displayed; unit may not start or may shut down shortly after starting.

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

Short circuit in compressor or fan motor, Faulty IPM module on outdoor PCB, Poor heat dissipation of IPM (blocked heatsink), Power supply issues causing overcurrent

How to Fix / Troubleshooting

Safety: This is a high-voltage inverter fault. Do not open the outdoor control box unless you are qualified.

User actions:

Turn off power for at least 10 minutes to allow the inverter to reset.
Ensure the outdoor unit is not exposed to direct intense sunlight without ventilation, which can overheat the electronics.

Technician actions:

Test compressor and fan motor insulation and resistance.
Inspect the outdoor PCB for burnt components and check IPM temperature sensor.
Replace the outdoor inverter PCB if IPM is confirmed faulty.

Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Inverter PCB (IPM Module)

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