How much does it cost to fix boiler error code L05?

Typical repair cost for the boiler L05 fault is £90-£160 including labour.

L05 High

Boiler Fault Code L05

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code L05 appears across 1 boiler brand 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 has lost its ability to accurately measure the temperature of the water coming back into the system, which is preventing it from heating up correctly. (As reported on Ideal Logic Code Combi ESP1)

Pick your boiler brand for the L05 fix

Ideal L05 3 models

Source

Information for the L05 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