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

Typical repair cost for the boiler E 01 fault is £150-300 including labour.

E 01 High

Boiler Fault Code E 01

Also written as E01 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code E 01 appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is failing to start because it cannot light the internal flame needed to provide your heating and hot water. (As reported on Keston C36p)

Pick your boiler brand for the E 01 fix

Johnson Starley E 01 1 model Keston E 01 2 models

Source

Information for the E 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