I have a Maytag dishwasher. I have a Maytag dishwasher MDBM601AWW. The control lock on the

Question

I have a Maytag dishwasher MDBM601AWW. The control lock on the control pad will not unlock. I replaced the electronic control board and it worked for one wash. Control lock engaged again. I shut down the power and pressed the control lock for 3 seconds as directed by the owners manual. No luck. Please help Rich.