Fault Codes / Vaillant / F.755

flexoTHERM/aroTHERM — 4-way valve position incorrect.

Possible causes

• Mechanical or electrical valve problem.
• Coil voltage incorrect.

Check steps

• Move 4-way valve from controller & observe.
• Check coil voltage during movement.

Affected parts

• 4-Wege-Ventil (Spule)

Safety note

Source: Vaillant resmi servis kılavuzu — ManualsLib s.40: 'F.755 – Fault: 4-way valve position incorrect'

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

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