BoilerFaultCodes Flue gas pressure switch High
Boiler Fault Code Flue gas pressure switch
Also written as FLUEGASPRESSURESWITCH — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Flue gas pressure switch appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected a problem with how it safely vents exhaust fumes, which is preventing it from lighting to ensure your safety. (As reported on Biasi Prisma)
Pick your boiler brand for the Flue gas pressure switch fix
Source
Information for the Flue gas pressure switch 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