Question about Microwave Ovens
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Posted on Jan 02, 2017
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 usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
NOTE: There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting.
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Jun 08, 2008
SOURCE: Microwave has no power
If your microwave oven doesn't seem to work at all, check these:
Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.
Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.
Posted on Jan 15, 2009
THe microwave has to be removed from the wall and then the outer cabinet has to be removed to get to the bulb. Do not do this with the unit plugged in and do not do this if u don't know how to work on a microwave as there is a shock hazard.
Posted on Jan 26, 2009
there is a fuse located underneath the outer cover, its called a ceramic fuse and is of cartridge type about 1" long by 1/8" diameter and has a white body and 2 silver ends and you can take it to a hardware store they have them but make sure to get correct amperage rating 15 or 20 amp
Posted on Sep 26, 2009
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....
Microwave Oven Basic Troubleshooting Tips
Posted on Sep 30, 2010
Tips for a great answer:
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It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.
Dec 27, 2010 | Microwave Ovens
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....
Microwave Oven Basic Troubleshooting Tips
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