Question about Microwave Ovens
A microwave can be dead for many reasons.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again. If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
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 when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.
If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
For many brands and models, you can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Apr 01, 2008
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Oct 21, 2014 | Microwave Ovens
Oct 31, 2013 | Hamilton Beach 1.1 Cu. Ft. 1000-Watts...
Nov 17, 2009 | Maytag MMC5000 Microwave Oven
Nov 13, 2017 | Kenmore Microwave Ovens
Mar 16, 2009 | Sanyo EM-Z2000S Microwave Oven
Nov 13, 2008 | Maytag MMC5000 Microwave Oven
Jul 08, 2008 | Danby Microwave Ovens
Jan 26, 2008 | Microwave Ovens
Jul 23, 2007 | GE JVM1460SA Microwave Oven
Oct 18, 2019 | In Microwave Ovens
307 people viewed this question
Usually answered in minutes!