When I turn on my machine, the pump keeps running for a few minutes. I see water continuously running back to the water tank by the drain hose. Sometimes it runs until “Error 3”, sometimes I ear a click, then a change in the pump noise, then it stops and work properly. I tried fiddling with the “on-off” setting of the steam boiler while this happens, and when I turn off the steam boiler, the pump stops. So I guess it is related to some level sensor malfunctioning in the steam boiler, or on a solenoid valve… Anyone ever solved this problem? Thanks!