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

Typical repair cost for the boiler L-01 fault is £100-350 including labour.

L-01 High

Boiler Fault Code L-01

Also written as L01 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code L-01 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 tried to fire up five times without success and has shut itself down for safety. (As reported on Ideal Concord CXA 40-120)

Pick your boiler brand for the L-01 fix

Biasi L-01 1 model Ideal L-01 1 model

Source

Information for the L-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