BoilerFaultCodes 198 Emergency
Boiler Fault Code 198
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 198 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling because the ventilation supplying air to the room where it is installed has become blocked or is insufficient, preventing the boiler from breathing properly. (As reported on Grant Vortex 15-20)
Pick your boiler brand for the 198 fix
Source
Information for the 198 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