Fault Codes / Viessmann / C5

Vitocal — Utility lockout – compressor off (by energy supplier).

Possible causes

• Utility lockout active.
• Permanent message due to wiring/terminal fault.

Check steps

• Normal case: wait for lockout to end.
• If permanent, check terminals X3.7 & X3.6.

Affected parts

• Rangierleiterplatte
• Lüsterklemmen

Safety note

Source: Viessmann resmi servis kılavuzu — Serviceanleitung WO1C, section 'C5 EVU Sperre' (p.107): 'Verdichter schaltet aus. Ursache: EVU-Sperre aktiv (ausgelöst vom Energieversorgungsunternehmen).'

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

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