Question about KitchenAid Microwave Ovens
On this model, the fuse holder is located on a metal panel behind either the grille or the control panel.
Please unplug the microwave before disassembly.
To remove the grille, there are two screws on top of the unit holding it in place. Once you remove those, you can pull up and out on the grille to remove it.
Just in case, look carefully in that area for the fuse holder and for the "mini-manual".
Then you'll see the screw you need to remove in the control panel frame. Then lift up and out to move it away from the microwave chassis.
Look for a fuse holder on a vertical metal sheet, apparently on the right side of that area.
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 TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
The TCOs you need to be concerned usually with have black wires. You can ignore the ones with blue / violet wires in this case.
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.
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.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
Please write back if you need further help.
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Posted on Sep 06, 2008
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