Dave for Model Number SMH1816S/XAA-0000 When plugged in the microwave starts and cooks without programming time and pushing start. When open the door it stops but when you close the door it starts again with the buzzing sound of the magnetron like it is cooking. Is it the main pcb or a door switch?
Answer Hello Dave. You will need to test the door switches. If good, then you will need to replace the main board on the unit. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html Read More... Answered by AppliancePartsPros.com | Monday, August 7, 2017