How much does it cost to fix boiler error code MAINS LED OFF?

Typical repair cost for the boiler MAINS LED OFF fault is £100-250 including labour.

MAINS LED OFF High

Boiler Fault Code MAINS LED OFF

Also written as MAINSLEDOFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code MAINS LED OFF appears across 2 boiler brands and 3 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 electricity flowing to it, meaning it cannot operate or communicate with your heating controls. (As reported on Potterton Performa System HE)

Pick your boiler brand for the MAINS LED OFF fix

Baxi MAINS LED OFF 2 models Potterton MAINS LED OFF 1 model

Source

Information for the MAINS LED OFF 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