Indoor unit displays H5 and the unit does not start or stops quickly.

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

Shorted inverter power module, Overheating of IPM due to poor ventilation, Incorrect supply voltage, Short circuit in compressor windings

Safety first: The inverter module carries lethal voltages. Do not touch components with power connected.

Step 1 – Ensure ventilation:
- Check that the outdoor unit vents are not blocked and that the sun is not directly overheating the control compartment.
Step 2 – Power reset:
- Turn off power for at least 15 minutes to allow the IPM to cool and reset.
Step 3 – Technician diagnosis:
- If H5 returns, a technician must test the IPM, compressor windings, and DC bus capacitors.
- IPM replacement is not a DIY repair and requires proper safety procedures.

Professional Required 5/5

Outdoor Inverter Power Module

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