BoilerFaultCodes Heating system High
Boiler Fault Code Heating system
Also written as HEATINGSYSTEM — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Heating system 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 stopped working because the water pressure in your radiators has dropped too low. (As reported on Grant Vortex Blue)
Pick your boiler brand for the Heating system fix
Source
Information for the Heating system 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