F.062 Emergency

Vaillant F.062 Fault Code

Also written as F062 — same fault.

The Vaillant F.062 fault code means: your boiler has detected an issue with the valve that controls its gas supply, meaning it is not shutting down as quickly as it should for safety reasons.. It appears on 3 Vaillant models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Gas valve defective. The flame switch-off was detected after a delay.
Typical repair cost £200-350 (including labour)

Engineer required

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

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Vaillant models that show the F.062 fault code

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

Source

Vaillant F.062 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026