74 High

Boiler Fault Code 74

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 74 appears across 3 boiler brands and 14 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is unable to move water around the system because either the main pump is stuck or the internal valves are blocked. (As reported on Vokera Linea HE)

Pick your boiler brand for the 74 fix

Alpha 74 10 models Vokera 74 3 models Worcester Bosch 74 1 model

Source

Information for the 74 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