We are in Finland in our Autosleeper Worcester and the water pump has stopped working. The water system is a Whale pressurised system; I have checked the fuse - No 4 - and that is OK. For a couple of days the pump has sometimes 'run-on' (or sounds as if it has) after the tap is switched off, particularly if the tap was run very slowly. Opening the tap fully then shutting it again has switched the pump off.

Any thoughts as to what may be wrong and the possible fix would be most welcome