Overheat light High

Boiler Fault Code Overheat light

Also written as OVERHEATLIGHT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Overheat light appears across 2 boiler brands and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has become too hot and has automatically shut down to prevent damage or safety issues. (As reported on Ideal Concord CXA 40-120)

Pick your boiler brand for the Overheat light fix

Baxi Overheat light 3 models Ideal Overheat light 1 model

Source

Information for the Overheat light 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