How much does it cost to fix Viessmann error code 2F:1?

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

2F:1 Low

Viessmann 2F:1 Fault Code

Q: What does the Viessmann 2F:1 fault code mean?

Your boiler is currently performing a necessary internal air-clearing process and will resume normal operation automatically once it is finished.

Also written as 2F1 — same fault.

The Viessmann 2F:1 fault code means: your boiler is currently performing a necessary internal air-clearing process and will resume normal operation automatically once it is finished.. It appears on 6 Viessmann models in our database.

Technical description: Venting program active

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 2F: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
Vitodens 333

Source

Viessmann 2F: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