BoilerFaultCodes F08 High
Boiler Fault Code F08
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F08 appears across 4 boiler brands and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because it cannot detect a stable signal from the sensor that monitors exhaust gases, often due to a loose wire or a faulty internal component. (As reported on Intergas Rapid 25 32)
Pick your boiler brand for the F08 fix
Source
Information for the F08 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