Fault Codes / Viessmann / 0A

Viessmann 0A

Critical

Vitocal — Outdoor unit fault (shuts off).

Viessmann 0A: Outdoor unit fault (shuts off). This fault typically halts operation and needs immediate attention.

Possible causes

Outdoor unit message / too frequent shutdown (with A9).
Refrigerant circuit sensor faulty.

Check steps

Check outdoor refrigerant control & sensors.
Check coding switches in outdoor unit.

Affected parts

Außeneinheit
Sensoren

Safety note

Follow F-Gas & 230/400V.

Source: Viessmann resmi servis kılavuzu — Serviceanleitung WO1C (2017-01 ed., Viessmann community PDF), section '0A Außeneinheit' (p.67): 'Außeneinheit schaltet sich aus. Ursache: Anzahl registrierter Ereignisse in der Außeneinheit hat die Meldeschwelle überschritten.' Matches app text 'Störung Außeneinheit (schaltet sic…

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

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