How much does it cost to fix boiler error code L7?

Typical repair cost for the boiler L7 fault is £80-150 including labour.

L7 High

Boiler Fault Code L7

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code L7 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 detected that it is running without enough water inside, which prevents it from operating safely to protect the system from overheating. (As reported on Baxi Combi 130 HE)

Pick your boiler brand for the L7 fix

Baxi L7 1 model Ideal L7 1 model

Source

Information for the L7 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 7 July 2026