H5
Friedrich IPM / Inverter Module Protection (Communication or Drive Fault)

Display shows H5, unit may not start or may shut down shortly after starting

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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

Faulty inverter module, poor connection between main control and IPM, software mismatch, shorted compressor, wiring fault

How to Fix / Troubleshooting

Safety: Turn OFF power and wait several minutes for capacitors to discharge before touching the inverter board.

Steps:

  • Inspect wiring: Check all harnesses between the main control board and the inverter module for secure connections and no visible damage.
  • Power reset: Disconnect power for 10–15 minutes, then restore and test. Transient faults may clear.
  • Check for board damage: Look for burnt or cracked components on the inverter module. Replace the module if damage is visible.
  • Compressor test: A technician should verify compressor integrity before installing a new inverter module.

Note: This is typically a technician-level repair.

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Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Inverter PCB
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