Indoor unit shows H5 and the system will not operate.

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 IPM on outdoor PCB, Shorted compressor windings, Poor heat sinking or thermal paste failure on IPM, Power surge damage

Safety first: This is a high-voltage inverter fault. Only qualified technicians should service IPM modules.

Step 1 – Power reset: Turn OFF power for 10 minutes, then restore. If H5 returns immediately, do not continue to run the unit.
Step 2 – Visual inspection: Check the outdoor PCB for burnt components, cracked solder joints, or discoloration around the IPM.
Step 3 – Professional testing: A technician should test compressor windings and the IPM module. Often the entire outdoor PCB is replaced as a unit.

Professional Required 5/5

Outdoor Inverter Power Board (IPM Module)

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