How much does it cost to fix boiler error code E74?

Typical repair cost for the boiler E74 fault is £90-160 including labour.

E74 High

Boiler Fault Code E74

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E74 appears across 3 boiler brands and 6 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 working because it cannot correctly measure the temperature of the water inside the system. (As reported on Warmhaus Enerwa)

Pick your boiler brand for the E74 fix

Ariston E74 4 models Keston E74 1 model Warmhaus E74 1 model

Source

Information for the E74 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