Fault Codes / Aux / F4

AU

Aux F4

Critical

Inverter — IPM/inverter module fault.

Aux F4: IPM/inverter module fault. This fault typically halts operation and needs immediate attention.

Possible causes

IPM faulty / compressor earth short.

Check steps

Power off: check compressor insulation & inverter.

Affected parts

Inverter-PCB
Verdichter

Safety note

High voltage! Let capacitors discharge.

Source: Aux Inverter Split Service Manual

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

Look up in Enthalio →

Related fault codes

Sensor fault.E5 Indoor room sensor open/short.E1 Indoor coil pipe sensor open/short.E2 Indoor fan motor fault.E3 Indoor ↔ outdoor communication error.E6 Outdoor air sensor open/short.F1