BoilerFaultCodes Overheating High
Boiler Fault Code Overheating
Also written as OVERHEATING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Overheating 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 shut down because it has detected that the water inside the system has become dangerously hot. (As reported on Ariston Excalibur)
Pick your boiler brand for the Overheating fix
Source
Information for the Overheating 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