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 27 April 2026

Fault code E74 appears across 3 boiler brands and 5 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 / Priwa)

Pick your boiler brand for the E74 fix

Ariston E74 3 models Biasi 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 27 April 2026