H5 error; unit does not start compressor

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

Overheated inverter module, Short circuit in compressor or wiring, Blocked outdoor ventilation, Faulty inverter PCB

Safety first: High voltage present. Only trained personnel should work on inverter electronics.

Check outdoor airflow: Ensure vents are clear and the unit is not enclosed.
Clean heat sink area: Dust off the inverter heat sink and ensure the cooling fan (if present) operates.
Inspect wiring: Look for signs of arcing or burnt insulation near the compressor terminals.
Allow cooling: Let the unit cool for at least 30 minutes, then restart.

If H5 reappears, the inverter module or compressor may be faulty; contact a SMEG service technician.

Professional Required 5/5

Outdoor Inverter Power Module PCB

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