Washer Machine will not start. Door did not lock and machine would not engage in any activity. Panel lights up. Tried to do diagnostic check and it won't allow me to go into mode, so no codes. Hired technician but he did not have an exact answer except that it was probably the computer control unit. I change CCU and still nothing. When I plugged in the machine after changing the CCU the door automatically locked. No other functions engaged. I had to manually unlock the door. Tried to run diagnostic test again and still would not allow me into the mode. I did hold down the start button with it on drain/spin cycle (no spin) and I got a couple of clicking noises from the CCU. What else could it be?