How much does it cost to fix boiler error code B LED 3?

Typical repair cost for the boiler B LED 3 fault is £80-150 including labour.

B LED 3 High

Boiler Fault Code B LED 3

Also written as BLED3 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code B LED 3 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 is currently idle because it is not receiving a signal from your thermostat or timer to start heating. (As reported on Ferroli Arean)

Pick your boiler brand for the B LED 3 fix

Ferroli B LED 3 2 models

Source

Information for the B LED 3 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