76 Emergency

Keston 76 Fault Code

The Keston 76 fault code means: your boiler has detected a flame when it shouldn't be there, so it has shut itself down to ensure your safety.. It appears on 1 Keston model 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: FALSE FLAME LOCKOUT / ERROR 20
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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Keston models that show the 76 fault code

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

Source

Keston 76 fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.

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