How much does it cost to fix Viessmann error code 00:1?

Cost varies. Contact a Gas Safe registered engineer for a quote.

00:1 Low

Viessmann 00:1 Fault Code

Q: What does the Viessmann 00:1 fault code mean?

Your boiler is currently operating on its basic factory configuration for a simple heating system and is not indicating a fault.

Also written as 001 — same fault.

The Viessmann 00:1 fault code means: your boiler is currently operating on its basic factory configuration for a simple heating system and is not indicating a fault.. It appears on 5 Viessmann models in our database.

Technical description: System design 1: 1 heating circuit without mixer A1, without DHW heating

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Viessmann models that show the 00:1 fault code

Click a model for the full fault code list and model-specific repair notes.

Vitodens 050-W
Vitodens 100-W / 200-W
Vitodens 200
Vitodens 200-W
Vitodens 222-W

Source

Viessmann 00:1 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026