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I have a kitchenaid built in oven mod# kebc177kss03. When oven gets above 300*F for more than 10-15 min the oven turns off with error message "door open". When I manually push in door latch when door IS open it which makes no difference, inaddition to opening and closing. If I slam door it MAY start up for a couple of minutes.

At lower temperatures oven works fine, and if I manually push in latch when door IS open I can turn oven on which would suggest this is not a problem caused by the door not closing properly.

I was thinking the problem is associated with a faulty door latch, or latch sister board. If so which is most likely.