HOW CAN i FIX MY Hotpoint wd 71 SHOWING E30?

My Hotpoint Washer Dryer WD 71 stopped when it was spinning and blown the main fuse.When I restart it again it shows E 30 refer to users guide.I've checked motor brushes and all connections.I've also fixed 'Y' connector to feed it just cold water and have checked the waste pipe but I could not fix it.When I turn it on I can hear its sensor click sound but it shows 'washing' and then sensor click again and screen shows E 30.Please help me to fix this problem