Boiler Fault Code t80 °C

Also written as T80C — same fault.

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

Fault code t80 °C 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 is displaying its current hot water temperature as part of its normal operating sequence and does not indicate a fault. (As reported on Potterton Powermax HE)