DHW PUMP panel LED flashing slow (1 per 2s) High

Boiler Fault Code DHW PUMP panel LED flashing slow (1 per 2s)

Also written as DHWPUMPPANELLEDFLASHINGSLOW1PER2S — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code DHW PUMP panel LED flashing slow (1 per 2s) 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’s internal control board has suffered an electrical component failure and can no longer operate the hot water pump. (As reported on Grant Vortex Blue)

Pick your boiler brand for the DHW PUMP panel LED flashing slow (1 per 2s) fix

Grant DHW PUMP panel LED flashing slow (1 per 2s) 1 model

Source

Information for the DHW PUMP panel LED flashing slow (1 per 2s) 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