BoilerFaultCodes 918 High
Boiler Fault Code 918
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 918 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has shut down because it has detected that the water inside is getting too hot, which is often caused by a blockage or a pump failure. (As reported on Ideal Response SE)
Pick your boiler brand for the 918 fix
Source
Information for the 918 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