Whirlpool will not start after many different attempts

My washer was stuch closed with water in it. we drained the water and released the door manually. ever since we can not get it to start. it just beeps three times as if the door is open. we replaced the door mech but it didn't help. We had a tech come and look at it and he said he couldn't get it to run a diagnostic. he ordered a control panel......long story short I installed the new panel and was able to run the diagnostic except after the error codes it goes the the drain/spin light only and that is it. I replaced the control panel back to the original and could do the same thing. Why does it go to the drain/spin light and do you have any other suggestions