Joe for Model Number samsung 1816s microwave fan runs constantly, on and off buttons will not do anything. It will turn off when the door is opened, but starts back up when door is closed. I replaced the key pad last year when this same problem occurred and it fixed it, but did not work this time.
Answer Hello Joe. It sounds like a door switch is bad and will need to be replaced 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 | Wednesday, April 5, 2017