BoilerFaultCodes 294 Emergency
Boiler Fault Code 294
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 294 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 dangerously high temperatures inside its cooling system and has shut down to prevent permanent damage or a fire hazard. (As reported on Navien NCM 1130HH)
Pick your boiler brand for the 294 fix
Source
Information for the 294 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