F.461 High

Viessmann F.461 Fault Code

Also written as F461 — same fault.

The Viessmann F.461 fault code means: your boiler has detected an issue with the sensor that monitors the safety flap in your flue, meaning the boiler has temporarily shut down to prevent unsafe operation.. It appears on 1 Viessmann model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Feedback signal of flue gas damper connection at EM-EA1 extension (DIO electronics module) preventing burner start.
Typical repair cost £150-300 (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 F.461 fault code

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

Source

Viessmann F.461 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 7 July 2026