No Flashes (after 15 seconds) High

Boiler Fault Code No Flashes (after 15 seconds)

Also written as NOFLASHESAFTER15SECONDS — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code No Flashes (after 15 seconds) 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 failed to detect a flame or a temperature reading, meaning it has completely shut down for safety. (As reported on Baxi Bermuda 552)

Pick your boiler brand for the No Flashes (after 15 seconds) fix

Baxi No Flashes (after 15 seconds) 1 model

Source

Information for the No Flashes (after 15 seconds) 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