How much does it cost to fix boiler error code Red light (flashing)?

Typical repair cost for the boiler Red light (flashing) fault is £90-280 including labour.

Red light (flashing) High

Boiler Fault Code Red light (flashing)

Also written as REDLIGHTFLASHING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Red light (flashing) appears across 2 boiler brands and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has encountered an internal error and needs a simple restart to try and clear the fault. (As reported on Glow-worm Swift Flow 100)

Pick your boiler brand for the Red light (flashing) fix

Glow-worm Red light (flashing) 1 model Potterton Red light (flashing) 8 models

Source

Information for the Red light (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