How much does it cost to fix boiler error code 46?

Typical repair cost for the boiler 46 fault is £80-180 including labour.

46 High

Boiler Fault Code 46

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 46 appears across 4 boiler brands and 35 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped running because an external safety thermostat has detected that the water temperature has become too hot. (As reported on Alpha E-Tec Regular)

Pick your boiler brand for the 46 fix

Alpha 46 21 models Ferroli 46 3 models Johnson Starley 46 10 models Vokera 46 1 model

Source

Information for the 46 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