I have a Kenmore dishwasher installed 2006. Rental house and don’t have long history with it. It has quit working. Clean light is blinking 7 times, pause, then 7 times. The drain cycle works and quits, no other controls work. Won’t fill or start any cycles. Owners manual indicates it’s something to do with the heater unit. Have tried unplugging to reset, no help. Can anyone help me? 