Fault Codes / Aux / P4

AU

Aux P4

Critical

Inverter — Condenser overload protection (cooling mode).

Aux P4: Condenser overload protection (cooling mode). This fault typically halts operation and needs immediate attention.

Possible causes

Condenser dirty/blocked or fan failure.

Check steps

Clean condenser, check fan operation.

Affected parts

Verflüssiger

Safety note

Isolate power before cleaning.

Source: AUX Air Conditioner Error Codes Reference, official auxair.com/global/error-codes.html (© 2024 AUX)

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

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