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

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

Error 01 High

Boiler Fault Code Error 01

Also written as ERROR01 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Error 01 appears across 2 boiler brands and 9 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 an electrical short-circuit in its internal wiring, which has triggered an automatic safety shutdown to prevent further damage. (As reported on Atag Q 25CR)

Pick your boiler brand for the Error 01 fix

Atag Error 01 8 models Johnson Starley Error 01 1 model

Source

Information for the Error 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