BoilerFaultCodes 143 Emergency
Boiler Fault Code 143
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 143 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 to get the right amount of air, which usually means the permanent ventilation opening in the room is obstructed or insufficient for the appliance to run safely. (As reported on Grant Vortex 15-20)
Pick your boiler brand for the 143 fix
Source
Information for the 143 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