Boiler Fault Code Overheat Limit Thermostat

Also written as OVERHEATLIMITTHERMOSTAT — same fault.

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

Fault code Overheat Limit Thermostat appears across 1 boiler brand 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 automatically shut itself down because it became too hot, acting as a safety measure to prevent damage. (As reported on Potterton Profile 30E)