How much does it cost to fix boiler error code No mains LED?

Typical repair cost for the boiler No mains LED fault is £150-350 including labour.

No mains LED High

Boiler Fault Code No mains LED

Also written as NOMAINSLED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code No mains LED 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 has completely lost power and is unable to turn on, likely due to a blown fuse or a failure in the electrical control board. (As reported on Worcester Bosch 24i RSF)

Pick your boiler brand for the No mains LED fix

Worcester Bosch No mains LED 1 model

Source

Information for the No mains LED 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