BoilerFaultCodes Boiler Fault Finding 12 Emergency
Boiler Fault Code Boiler Fault Finding 12
Also written as BOILERFAULTFINDING12 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Boiler Fault Finding 12 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is allowing burnt gases to escape inside or near the unit, which is a serious safety concern that requires an immediate professional inspection. (As reported on Grant Vortex Eco)
Pick your boiler brand for the Boiler Fault Finding 12 fix
Source
Information for the Boiler Fault Finding 12 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