Question about Kenmore 62642 / 62644 / 62649 Microwave Oven
A microwave can be dead for many reasons.
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 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.
When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
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 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 on 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 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
You can probably find an exploded view by entering your FULL model number here: http://www.searspartsdirect.com
A full Sears/Kenmore model number usually has 3 digits, a dot, then 8 more digits, such as ###.########
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Jun 23, 2008
Tips for a great answer:
Feb 02, 2015 | Microwave Ovens
Sep 20, 2011 | Frigidaire Microwave Ovens
Sep 18, 2011 | Kenmore 80822 80823 80824 80829 1500...
Mar 14, 2011 | GE XL1800 1100 Watts Microwave Oven
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....
Basic Microwave Oven Troubleshooting Tips
Feb 19, 2011 | Jenn-Air JMC7000 Microwave Oven
Nov 06, 2009 | GE Spacemaker JVM1640SJ Microwave Oven
Oct 19, 2009 | LG 1.2 Cu. Ft. Mid-Size Microwave -...
Jul 29, 2009 | GE Spacemaker JVM1640SJ Microwave Oven
Feb 12, 2009 | Sharp KB-6015K 1000 Watts Convection /...
99 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: