6L High

Boiler Fault Code 6L

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 6L appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is successfully lighting, but it cannot stay lit and keeps cutting out while it is running. (As reported on Ideal Maximiser SE)

Pick your boiler brand for the 6L fix

Ideal 6L 1 model

Source

Information for the 6L 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