If your Whirlpool Microwave Combination Built-In oven is giving you the error code “door” in the display and you can’t restart the unit, then the door-monitoring portion of the microcomputer board is fried. The only cure is to replace the microcomputer board. Whirlpool just started making more of these boards in July 2002 so there could be some delays in getting a new one but you can special order it here.