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

Typical repair cost for the boiler E 01 fault is £120-220 including labour.

E 01 High

Boiler Fault Code E 01

Also written as E01 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E 01 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 is unable to accurately measure the temperature of the water inside it, likely due to a loose connection or a faulty sensor. (As reported on Vokera Verve I 50)

Pick your boiler brand for the E 01 fix

Johnson Starley E 01 2 models Keston E 01 2 models Vokera E 01 1 model Warmhaus E 01 1 model

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 7 July 2026