Vaillant F.1118

Critical

flexoTHERM/aroTHERM — Compressor: wrong phase sequence.

Vaillant F.1118: Compressor: wrong phase sequence. This fault typically halts operation and needs immediate attention.

Possible causes

Wrong phase sequence at mains supply.
Soft starter faulty/wrongly connected.

Check steps

Swap 2 phases at the mains supply.
Check soft starter.

Affected parts

Anlaufstrombegrenzer
Netzeinspeisung

Safety note

Wrong rotation destroys compressor; 400 V – de-energise.

Source: Vaillant resmi servis kılavuzu — Vaillant flexoTHERM exclusive VWF 57/4 — Installation and Maintenance Instructions (E Fault Codes table, page 47): "F.1118 — Compressor: Incorrect phase seq. — Incorrect order of phase connection to the mains supply; In-rush current limiter defective. Remedy: Switch two phases at…

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

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