Have encountered a problem with Siemens WM50900 washing machine. Water does not drain after wash on any of the cycles. There is no blockage in any hoses. The pump impeller rotates and there is no debris/fluff blockage. It tries to pump out for a while then turns off and the active light starts flashing. I have replaced the pump as I was advised this was the problem but it still is doing the same thing. I bought this W/M from a friend and truly like the size and quality, but didn't realize I would have to buy all parts from the UK area. It is still in like new condition so would like to fix it. Any advice would be much appreciated.