How much does it cost to fix boiler error code Neon 4 lit?

Typical repair cost for the boiler Neon 4 lit fault is £90-180 including labour.

Neon 4 lit High

Boiler Fault Code Neon 4 lit

Also written as NEON4LIT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Neon 4 lit 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 is failing to light the small internal flame needed to start the main burner, which means your heating and hot water will not work. (As reported on Glow-worm Ultimate3)

Pick your boiler brand for the Neon 4 lit fix

Glow-worm Neon 4 lit 2 models Saunier Duval Neon 4 lit 2 models

Source

Information for the Neon 4 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