How much does it cost to fix boiler error code Flashing mains LED?

Typical repair cost for the boiler Flashing mains LED fault is £120-£200 including labour.

Flashing mains LED High

Boiler Fault Code Flashing mains LED

Also written as FLASHINGMAINSLED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Flashing 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 detected an internal sensor failure and has stopped working to prevent damage or overheating. (As reported on Worcester Bosch 24i RSF)

Pick your boiler brand for the Flashing mains LED fix

Worcester Bosch Flashing mains LED 1 model

Source

Information for the Flashing 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