H5
Haier
IPM (Inverter Power Module) Protection
Indoor unit shows H5 and the outdoor unit does not start; no cooling or heating.
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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
Shorted IPM on outdoor PCB, Overheating of inverter module, Short circuit in compressor windings, Poor heat dissipation on outdoor PCB
How to Fix / Troubleshooting
Safety first: Disconnect power and wait for capacitors to discharge. High DC voltages are present in the inverter section.
- Visual inspection: Check the outdoor PCB for burnt components, cracked solder joints, or discolored heat sinks.
- Ensure ventilation: Confirm that the outdoor control box is not blocked and that its cooling path is clear.
- Do not attempt DIY board repair: IPM replacement and testing require specialized skills and tools.
- Professional service: A technician should test compressor insulation and replace the outdoor inverter PCB if the IPM is faulty.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter PCB (IPM Module)
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