How much does it cost to fix boiler error code 5 red flashes?

Typical repair cost for the boiler 5 red flashes fault is £120-250 including labour.

5 red flashes High

Boiler Fault Code 5 red flashes

Also written as 5REDFLASHES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 5 red flashes appears across 2 boiler brands and 14 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal memory chip has developed a communication fault, meaning the control board can no longer read its essential settings. (As reported on Baxi EcoBlue Plus Combi)

Pick your boiler brand for the 5 red flashes fix

Baxi 5 red flashes 13 models Main 5 red flashes 1 model

Source

Information for the 5 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