How much does it cost to fix boiler error code Burner reset light red flash (0.5s on, 2.5s off)?

Typical repair cost for the boiler Burner reset light red flash (0.5s on, 2.5s off) fault is £90-180 including labour.

Burner reset light red flash (0.5s on, 2.5s off) High

Boiler Fault Code Burner reset light red flash (0.5s on, 2.5s off)

Also written as BURNERRESETLIGHTREDFLASH05SON25SOFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Burner reset light red flash (0.5s on, 2.5s off) appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it cannot complete its initial warm-up sequence, likely due to a disconnected internal plug or a fault with the pre-heating system. (As reported on Grant Vortex Blue)

Pick your boiler brand for the Burner reset light red flash (0.5s on, 2.5s off) fix

Grant Burner reset light red flash (0.5s on, 2.5s off) 1 model

Source

Information for the Burner reset light red flash (0.5s on, 2.5s off) 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 7 July 2026