Boiler Fault Code F.027

Also written as F027 — same fault.

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

Fault code F.027 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is confused and thinks it is still burning gas even though it has told itself to switch off, which is a safety lockout to prevent accidental ignition. (As reported on Vaillant ecoTEC plus)