When I plug in the unit the display flashes ER with all the other lights also flashing, cleaning, drying, clean and a big S, with a motor running underneath which I think is the drain pump. Could it be the control board?
The ER is an indication that there is a membrane switch failure. The main control board has detected a stuck key or a key pressed for more than one minute. Check the connection from the keypad to the Main control board. If correct, replace the keypad. If error still exist, replace the main control board.