Sounds like we both have the same problem, see my post :

(http://forum.appliancepartspros...tron-wont-turn-off.html) The post prior to yours.

I have not received any replies from this forum yet, but did receive one from another source. They told me it probably was the Smart Board, and could have been caused by a power surge. I unplugged the unit for 5 minutes and it cleared itself on 1-5-15. Still working on 1-8-15. I am just glad I noticed the mag was still on after the defrost cycle had completed. It was continuing to cook the edges of the meat I was trying to defrost and I don't know what eventually would have happened had I not checked on it within a few minutes.

Good luck,

Ken