BoilerFaultCodes Boiling High
Boiler Fault Code Boiling
Also written as BOILING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Boiling appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is overheating because it cannot move the hot water away from the heating unit quickly enough, or it is struggling to accurately read its own temperature. (As reported on Worcester Bosch Greenstar 27CDi)
Pick your boiler brand for the Boiling fix
Source
Information for the Boiling 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