How much does it cost to fix boiler error code L01?

Typical repair cost for the boiler L01 fault is £100-250 including labour.

L01 High

Boiler Fault Code L01

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code L01 appears across 2 boiler brands and 2 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 safely and is locked out, but the specific reason is shown by the number following the letter 'L' on your display. (As reported on Ideal INDEPENDENT COMBI2)

Pick your boiler brand for the L01 fix

Biasi L01 1 model Ideal L01 1 model

Source

Information for the L01 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 31 August 2026