Boiler Fault Code Overheat detection

Also written as OVERHEATDETECTION — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Overheat detection appears across 1 boiler brand and 3 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 itself down because it detected that it is running too hot, indicating a potential circulation or sensor problem. (As reported on Chaffoteaux 80/100)