2F:0 Medium

Viessmann 2F:0 Fault Code

Also written as 2F0 — same fault.

The Viessmann 2F:0 fault code means: your boiler is currently stuck in an automated air-clearing or water-filling mode, meaning it cannot provide heat or hot water until the cycle is finished or reset.. It appears on 6 Viessmann models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Ventilation program/filling program inactive
Typical repair cost £120-250 (including labour)

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:0 fault code

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

Source

Viessmann 2F:0 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