How much does it cost to fix boiler error code E 03?

Typical repair cost for the boiler E 03 fault is £250-450 including labour.

E 03 High

Boiler Fault Code E 03

Also written as E03 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E 03 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's main internal computer is failing to communicate correctly, which has caused the system to stop working entirely for safety reasons. (As reported on Vokera Hydra)

Pick your boiler brand for the E 03 fix

Ideal E 03 1 model Keston E 03 3 models Vokera E 03 1 model

Source

Information for the E 03 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