BoilerFaultCodes Alternating flashing Low
Boiler Fault Code Alternating flashing
Also written as ALTERNATINGFLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Alternating flashing 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 is currently running an internal self-test or setup process, which is a normal operation that should finish on its own. (As reported on Vokera Compact 28 SE)
Pick your boiler brand for the Alternating flashing fix
Source
Information for the Alternating flashing 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