Question about Microwave Ovens
Swan SM21040 900-watt manuals
Posted by Anonymous on
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Posted on Jan 02, 2017
A microwave can be dead for many reasons.
It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
At our site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
There should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.
If you don't find your tech sheet, you can download it here.
If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.
You can download Whirlpool owner's manuals and installation instructions here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Nov 23, 2008
Hello, This is a repeat of a previous post I made some time ago. It is for your make/model, if it is built in....
Mine is installed also, and I've had to replace the bulb twice. I wised up the second time and installed an access hole where I can pull my microwave out about 6" and access the bulb. I use a 35 watt 120v halogen bulb, with a GY 8.6 base, Lowe's part number 15797. If your's is different, the specs will be stamped on the metal beside the reflector when you remove the sheetmetal. You have to remove the microwave completely from the cabinet and remove the sheetmetal case that surrounds the entire unit. You can then access the lamp socket by looking in from the top. The first time, I took out the reflector with the socket. The bulb can be replaced by removing the two small screws adjacent to the socket on top of the reflector. My access port is a hole cut into the top. I cover the hole with a piece of sheetmetal and two sheetmetal screws. Seems to work just fine. If you do decide to cut a hole, do so with the metal enclosure off and away from the microwave to avoid getting any metal shavings into the machine!
If, however, yours is an over the stove type, it may be possible to remove the front grille and replace the lamp.
Regards! --W/D-- feel free to rate this solution! Thanks!
Posted on Jul 31, 2009
If all appears to be running as its working but just no heat. Could be issue with magnetron. You could also have loose connections to magnetron or somewhere in high voltaged as well.
Posted on Nov 25, 2009
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