SOURCE: microwave stopped working completely
Fan turned on after cooking because a thermostat got to hot and tripped turning on the fan to try to cool the unit. The unit went completely dead when thermal fuse tripped which is located above the cavity on the left side.
SOURCE: MCO160UW
It sounds like the magnetron is overheating and the magnetron-mounted thermostat is tripping.
This can happen if the internal cooling fan is not running - do you feel air strongly coming out the back or other vent?
If it has grease or other filters, be sure they are clean and not blocked.
Otherwise, the magnetron may be failing. Please post back once you've looked this over if you need more help.
SOURCE: Replacing the fuse of a MCO160UW
A microwave can be dead for many reasons.
It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.
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 (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.
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.
There may 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 & testing.
We're happy to help you and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Microwave turns on by itself
You have a shorting keypad. This can be very dangerous and result in a fire.
So until it is repaired, please leave it unplugged or leave the door open when it;s not in use, and please do not leave it running unattended.
If you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.
You can usually find Magic Chef parts here.
If not, please reply back with your model number so we can help you.
If you would like to have us do this for you, we do that for $39.95 plus part costs.
Feel free to contact me directly (and please remind me of your model number) for more information & help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Magic Chef Model #MCO160UW
Call 888-775-0202 Magic chef they will replace the part free of charge even if its not longer under warranty
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