Fault Codes / Vaillant / F.718

flexoTHERM/aroTHERM — Fan unit: fan blocked – rotation signal missing.

Possible causes

• Air path blocked.
• Fuse F1 (OMU PCB) faulty.

Check steps

• Check air path, remove blockage.
• Check/replace fan-unit fuse F1.

Affected parts

• Lüfter
• Sicherung F1

Safety note

Source: Vaillant resmi servis kılavuzu — Vaillant flexoTHERM exclusive VWF 57/4 — Installation and Maintenance Instructions (E Fault Codes table, page 44): "F.718 — Fan unit 1: Fan blocked — No confirmation signal that fan rotates." Matches app wording (fan blocked / rotation signal missing) essentially verbatim.

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

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