How much does it cost to fix boiler error code Overheat thermostat?

Typical repair cost for the boiler Overheat thermostat fault is £150-300 including labour.

Overheat thermostat High

Boiler Fault Code Overheat thermostat

Also written as OVERHEATTHERMOSTAT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Overheat thermostat appears across 7 boiler brands and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because it has detected an unsafe rise in internal temperature and needs a professional to check it is venting heat correctly. (As reported on Ideal Concord Cxdi)

Pick your boiler brand for the Overheat thermostat fix

Alpha Overheat thermostat 1 model Ariston Overheat thermostat 2 models Grant Overheat thermostat 10 models Halstead Overheat thermostat 2 models Heatline Overheat thermostat 2 models Ideal Overheat thermostat 3 models Potterton Overheat thermostat 2 models

Source

Information for the Overheat thermostat 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 7 July 2026