HOTPOINT FDW20 TRIPS OUT HOUSE EARTHLEAKAGE?

Washer starts but eventually trips out the whole house eathleakage switch. After a few hours it can be started again but the same happens. I can find no sign of burning parts or water on connections inside. Is some electrical part breaking down to earth but somehow resetting itself? Note:- A reading of only a few hundred K ohms can be read with a digital meter between line and earth on mains plug after trip out. Any help or suggestions greatly appreciated as machine is only 3 years old and my last one a Zanussi lasted for only 2 years! Thanks