H5
Klarstein IPM / Inverter Module Protection (Inverter Models)

The display shows H5 and the 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

Overcurrent or overtemperature in the inverter module, shorted compressor windings, blocked condenser, defective inverter PCB

How to Fix / Troubleshooting

Critical safety: Inverter circuits store high voltage even after power is removed. Do not touch inverter components unless you are trained and have verified that capacitors are discharged.

User-level checks:

  • Power reset: Turn off the power at the breaker for at least 15 minutes, then restore it and test.
  • Airflow: Ensure the condenser is clean and the fan is working properly.

Technician-level checks:

  • Compressor windings: Measure resistance and insulation to ground. Replace the compressor if shorted.
  • Inverter PCB: Inspect for burnt components. Replace the inverter module/PCB if defective.

Due to the risk of electric shock, H5 faults should generally be handled by a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Power Module / Outdoor PCB
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