How much does it cost to fix boiler error code Mains On neon NOT lit?

Typical repair cost for the boiler Mains On neon NOT lit fault is £70-160 including labour.

Mains On neon NOT lit High

Boiler Fault Code Mains On neon NOT lit

Also written as MAINSONNEONNOTLIT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Mains On neon NOT lit appears across 1 boiler brand 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 no power and is completely unresponsive, likely due to an electrical supply issue or a blown fuse. (As reported on Ideal Response)

Pick your boiler brand for the Mains On neon NOT lit fix

Ideal Mains On neon NOT lit 2 models

Source

Information for the Mains On neon NOT lit 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