How much does it cost to fix boiler error code 5 Red Flashes?

Typical repair cost for the boiler 5 Red Flashes fault is £120-350 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 27 April 2026

Fault code 5 Red Flashes appears across 1 boiler brand and 27 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 software or connection error, meaning it can no longer remember its correct settings to operate. (As reported on Baxi MainEco)

Pick your boiler brand for the 5 Red Flashes fix

Baxi 5 Red Flashes 27 models

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 27 April 2026