Why is the pump on the accumulator running on/won’t turn off?

If the pump on the accumulator is running on/won’t turn off it could mean that the vessel has not reached full water capacity and the pump is still running to fill. It could also indicate a leak in system. Allow sufficient time for vessel to reach full capacity (this can vary between 5-40 mins depending on vessel size) and check all outlets are closed and there are no leaks on the pipework.