Is the pump running while it is filling. If so you may have a water leak underneath operating a flood switch or it may have a faulty pressure switch which is not stopping the inflow when the correct level is reached. Also where is the drain hose. It must go up higher than any normal water level before going to the drain. So if pump is not running then look at level of drain hose. It may be syphoning the water out.
Lincoln Appliance NZ, October 2008
