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

Typical repair cost for the boiler E 04 fault is £150-350 including labour.

E 04 High

Boiler Fault Code E 04

Also written as E04 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E 04 appears across 4 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 has detected a major internal error that has forced it to shut down for safety reasons. (As reported on Vokera Hydra)

Pick your boiler brand for the E 04 fix

Chaffoteaux E 04 1 model Ideal E 04 1 model Keston E 04 3 models Vokera E 04 1 model

Source

Information for the E 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