29.08.2019
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. 9098 Answers SOURCE: The most common suspect here is a shorted high voltage capacitor, since you say it blew the fuse right after Start, but I would certainly suggest checking the door switches and door switch mounts first. Just be sure you installed the right fuse.
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It would be a The switch mounts seem to break at about this point in the life of these models. 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: You can find helpful exploded view diagrams and order parts by entering your model number here: (the three is correct). 9098 Answers SOURCE: 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.
Kenmore Microwave Parts List
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: You can probably find an exploded view by entering your FULL model number here: We're happy to help and we appreciate your thoughtful rating of our answer. Posted on Jun 08, 2008. Dead appliance, power on wall outlet. YOUR SAFETY IS PARAMOUNT! Attempt this only if you are competent.
If your appliance has absolutely no functions at all, remove it from the mains supply, remove the case and see where the mains lead goes in to the appliance and follow the cable until you find the main fuse. ONLY USE THE SAME TYPE AND RATING OF FUSE TO REPLACE IT. The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
Hope this helps. Mar 31, 2011. The main fuse or the thermal cutout is probably blown. If the main fuse is blown, most likely the high voltage capacitor is shorted and must be replaced.
If this is the case, it's a good idea to also replace the high voltage diode because it took a large over-current hit before the fuse blew. Be sure the oven is unplugged before measuring the resistance of the fuse or capacitor (the diode should read open in both directions because the forward voltage is more than a typical ohmmeter can put out). (Note: replacing the fuse without identifying and fixing the short or overload will simply waste the new fuse. It's not like the old farmhouse with one fuse for a dozen outlets going out because one item too many was plugged in.) The capacitor is available on Amazon for less than $17 (be sure the voltage and uF values match the one in your oven), the diode is about half of that, and the fuse should be under $3.
Kenmore Elite Microwave Oven
If the thermal cutout is blown, check the magnetron cooling provisions - make sure the fan turns freely, the blades are clean, and all vents are clean. After replacing the thermal cutout, verify that magnetron cooling fan runs at speed when the oven is running.
Keep your hands and tools out of the oven if you are testing it with the cover off. The high voltage side can be energized by as much as 1800 Volts.
An arc from this can cause serious damage or personal injury. Oct 18, 2017.