E50 Medium

Boiler Fault Code E50

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E50 appears across 4 boiler brands and 58 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's temperature sensor for hot water has developed a fault, meaning the system may struggle to heat your water to the correct temperature. (As reported on Potterton Promax System HE Plus)

Pick your boiler brand for the E50 fix

Baxi E50 33 models Biasi E50 7 models Main E50 4 models Potterton E50 14 models

Source

Information for the E50 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