How much does it cost to fix boiler error code L0?

Typical repair cost for the boiler L0 fault is £80-220 including labour.

L0 High

Boiler Fault Code L0

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code L0 appears across 2 boiler brands and 4 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 either its exhaust pipe is obstructed or the pipe that drains away waste water is blocked. (As reported on Ideal Logic Code Combi ESP1)

Pick your boiler brand for the L0 fix

Baxi L0 1 model Ideal L0 3 models

Source

Information for the L0 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