We have a Kenmore Disk Washer for 8 years, but use it for only few times. Recently, the LOCK is always on and it cannot be turned. I need to unplug the disk washer for a night and replug in. It works fine for a few hours and the LOCK is on again. I need to repeat the process again. I believe the circuit board is no working properly. Is there way I can repair the circuir board or someone can repair it? Is replacing the whole circuit board the only solution? Many Thanks.

I've tried to press NORMAL WASH and HEATED DRY repeatly. It doesn't work. Any suggestions?