How much does it cost to fix boiler error code FLASH OFF FLASH?

Typical repair cost for the boiler FLASH OFF FLASH fault is £100-350 including labour.

FLASH OFF FLASH High

Boiler Fault Code FLASH OFF FLASH

Also written as FLASHOFFFLASH — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code FLASH OFF FLASH appears across 2 boiler brands and 28 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is not receiving enough electrical power from the main supply to operate safely. (As reported on Baxi Solo)

Pick your boiler brand for the FLASH OFF FLASH fix

Baxi FLASH OFF FLASH 24 models Potterton FLASH OFF FLASH 4 models

Source

Information for the FLASH OFF FLASH 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