BoilerFaultCodes 80 B High
Boiler Fault Code 80 B
Also written as 80B — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 80 B 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 is not detecting a flame, which means it has safely shut down because it cannot ignite the gas to provide heat or hot water. (As reported on Sime Format B Combi)
Pick your boiler brand for the 80 B fix
Source
Information for the 80 B 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 7 July 2026