Lights: Flash Flash On High

Boiler Fault Code Lights: Flash Flash On

Also written as LIGHTSFLASHFLASHON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Lights: Flash Flash On appears across 2 boiler brands and 6 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 the internal component responsible for moving air and gases through the system has failed to start correctly. (As reported on Potterton Promax HE Store)

Pick your boiler brand for the Lights: Flash Flash On fix

Baxi Lights: Flash Flash On 3 models Potterton Lights: Flash Flash On 3 models

Source

Information for the Lights: Flash Flash On 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