Fault Codes / Viessmann / C2

Viessmann C2

High

Vitocal — Power supply of KM-BUS components.

Viessmann C2: Power supply of KM-BUS components. This fault noticeably affects operation.

Possible causes

Overload/short on KM-BUS supply.

Check steps

Disconnect KM-BUS parts one by one to isolate fault.
Check wiring for short.

Affected parts

KM-BUS-Leitung

Safety note

Isolate power.

Source: Viessmann resmi servis kılavuzu — Manual p.41: 'C2 Spannungsversorgung' = Fehler der Spannungsversorgung Verdichter oder Phasenwächter defekt — concerns compressor power/phase monitor, NOT 'KM-BUS-Komponenten' as Enthalio DB states; DB description narrow

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

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