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

Typical repair cost for the boiler L-F fault is £120-350 including labour.

L-F High

Boiler Fault Code L-F

Also written as LF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code L-F appears across 1 boiler brand and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has failed to light or maintain a flame, meaning your heating and hot water have stopped working. (As reported on Ideal Mexico HE)

Pick your boiler brand for the L-F fix

Ideal L-F 12 models

Source

Information for the L-F 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