Fault Codes / Vaillant / F.753

flexoTHERM/aroTHERM — Connection fault: inverter not detected.

Possible causes

• Main PCB ↔ inverter box link damaged/interrupted.
• Inverter box not powering up / parameter wrong.

Check steps

• Check inverter box link & power.
• Check parameter per manual.

Affected parts

• Wechselrichterbox (Umrichter)
• Verbindungsleitung

Safety note

Source: Vaillant resmi servis kılavuzu — ManualsLib s.40: 'F.753 – Connection fault: Inverter not recognised'

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

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