How much does it cost to fix boiler error code 3 red flashes?

Typical repair cost for the boiler 3 red flashes fault is £120-280 including labour.

3 red flashes High

Boiler Fault Code 3 red flashes

Also written as 3REDFLASHES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 3 red flashes appears across 3 boiler brands and 15 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has tried to light itself several times but cannot establish a flame, meaning you will have no heating or hot water until it is reset or repaired. (As reported on Baxi EcoBlue Plus Combi)

Pick your boiler brand for the 3 red flashes fix

Baxi 3 red flashes 13 models Main 3 red flashes 1 model Potterton 3 red flashes 1 model

Source

Information for the 3 red flashes 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 31 August 2026