Fault Codes / Vaillant / F.539

Critical

flexoTHERM/aroTHERM — Refrigerant pressure too low.

Possible causes

• Low charge / low airflow.
• No defrost / 4-way valve faulty.
• EEV motor or connection faulty.

Check steps

• Check charge, airflow & defrost.
• Check 4-way valve & EEV.

Affected parts

• Kältemittel
• 4-Wege-Ventil
• Expansionsventil (EEV)

Safety note

Source: Vaillant resmi servis kılavuzu — ManualsLib s.39: 'F.539 – Refrigerant pressure too low'

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

Look up in Enthalio →

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