I'm fairly sure the fan has a door switch and that may have failed. if you take the outer cover off the micro wave itself you hopefully will have a wiring diagram of the unit. Many times I have had to replace micro wave door switch's that have failed not letting it start or sometimes such as yours something like the light staying on. Being that you are a service man, I don't have to tell you be sure to disconnect the power to it and then you can use your ohm meter to check the switches. Hope this helps you
Most probably the door switch, as stated before by others.
It does sound like a microswitch problem for sure but most of the time the microswitch doesn't go bad or stick, it's the plastic door latch itself that engages the microswitch that actually wears out, the plastic just wears down a little. It's always a good idea to put a small amount of food grade silicone on the latch to keep the wear to a minimum. That mechanism, including the springs, is in the door itself. You have to take the choke off to get to it (the choke is the rectangular piece of plastic that conceals the door latches). You won't get this off without breaking it (at least i never have) so just order a new one if you order the new door latch kit. Still double check to make sure the microswitches aren't sticking before you start ordering parts.
I am sorry I am unable to answer your question as I too am not having any knowledge of microwaves. My name would hve cropped up because I sought advice from FIXYA regarding some problem on my microwave. Sorry about inability to help.
SOURCE: Emerson microwave Glass turntable replacement
The part number was shown as M0S0885 (or MOS0885) but it is listed as "no longer available". In some cases, two microwave-safe plates can serve as a makeshift replacement for a missing tray. You have to find a saucer that fits securely on your turntable support, though. I've attached a photo. One last option would be a Nordicware or Rubbermaid or similar wind-up carousel. Wal-Mart had them when I checked a few months ago, and you can find them on Google's Froogle site at http://froogle.google.com by searching for the key words: wind-up turntable.
SOURCE: Microwave runs with door open
I would say you have a failing door switch or the mount which holds your door switch is loose or broken. In most designs, it is the upper door switch that will produce these very symptoms when it is intermittent or its mount is broken or loose. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure. Slamming the door, damage during shipping or transportation and sloppy manufacturing techniques or materials are the primary causes of trouble with the door switch mounts. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
SOURCE: Problems with my microwave (Emerson MW9090SS)......
Most probably the fuse has blown out...You have to replace it..Dont worry it wont cost you much..If you need help locating the fuse feel free to ask..
SOURCE: Emerson microwave light out
There is a way but.... you will have to remove outer cover generally held on with screws at rear and under microwave be sure the oven is unplugged and when you take cover off there is a capacitor in there thats holds a charge stored even when oven is unplugged so dont touch nothing except the light bulb would prefer if you dont have much electrical experience to take to repair shop or have someone do it who has a little electrical knowledge hope this helps
SOURCE: Wattage for MW8985WD microwave
I still have a orginal lable on my microwave, it is a 800 watt oven.
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