How much does it cost to fix boiler error code E.04 – .01?

Typical repair cost for the boiler E.04 – .01 fault is £90-160 including labour.

E.04 – .01 High

Boiler Fault Code E.04 – .01

Also written as E0401 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E.04 – .01 appears across 1 boiler brand and 24 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 leaving the unit due to a faulty internal sensor or wiring. (As reported on Baxi 200 / 400 Combi)

Pick your boiler brand for the E.04 – .01 fix

Baxi E.04 – .01 24 models

Source

Information for the E.04 – .01 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