How much does it cost to fix boiler error code LED1 on, LED2 flashing?

Typical repair cost for the boiler LED1 on, LED2 flashing fault is £120-280 including labour.

LED1 on, LED2 flashing High

Boiler Fault Code LED1 on, LED2 flashing

Also written as LED1ONLED2FLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code LED1 on, LED2 flashing appears across 1 boiler brand and 6 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 a problem with how it moves air and exhaust gases through the system, preventing it from firing up safely. (As reported on Ideal Mini HE)

Pick your boiler brand for the LED1 on, LED2 flashing fix

Ideal LED1 on, LED2 flashing 6 models

Source

Information for the LED1 on, LED2 flashing 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