How much does it cost to fix boiler error code E.00 – .04?

Typical repair cost for the boiler E.00 – .04 fault is £90-160 including labour.

E.00 – .04 High

Boiler Fault Code E.00 – .04

Also written as E0004 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E.00 – .04 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 detected a problem with the internal sensor that monitors water returning from your radiators, meaning it cannot safely regulate its temperature and has stopped working. (As reported on Baxi 200 / 400 Combi)

Pick your boiler brand for the E.00 – .04 fix

Baxi E.00 – .04 24 models

Source

Information for the E.00 – .04 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