BoilerFaultCodes 5 (Flashing Light) High
Boiler Fault Code 5 (Flashing Light)
Also written as 5FLASHINGLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 5 (Flashing Light) appears across 1 boiler brand and 9 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 water pressure inside your heating system has dropped too low to operate safely. (As reported on Ferroli Modena HE)
Pick your boiler brand for the 5 (Flashing Light) fix
Source
Information for the 5 (Flashing Light) 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