BoilerFaultCodes F27 High
Boiler Fault Code F27
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F27 appears across 2 boiler brands and 17 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has sensed a flame when there shouldn't be one, or the sensor that monitors the fire is sending a confusing signal to the control board. (As reported on Glow-worm Ultracom 24cx 30cx)
Pick your boiler brand for the F27 fix
Source
Information for the F27 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026