HI. Your symptoms are a strong indication of Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.
The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).
Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.
WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.
Concerning the fan; If the fan motor has failed, that will be the reason for the failure of the magnetron heating device. Without proper air flow, the magnetron will overheat and fail. The job of the Cut-off fuse is to prevent the failure by shutting down the magnetron and cutting the heating circuit. This is why you should test the fuse first, if possible. If the fuse is ok, the magnetron will need to be replaced along with that failed fan motor assembly. Again: you must discharge the capacitor before testing any components in a microwave oven. You could risk serious injury if not done correctly. If you are not familiar with the proper discharging methods of a HV capacitor, I would advise to contact your local Microwave service tech for this repair.
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Hello,
If a user sets up a microwave and turns it on, one would expect it to
heat the food in it. If it doesn't, it has probably developed an
electrical fault. If everything comes on when it is started, like the light in the cavity
and the fan (which one can hear running), and the timer counts down but
it doesn't heat, the problem is probably isolated to the high voltage
section of the oven.
9
Out of 10 Times when there is no heat and everything else works fine it
is the Magnetron. The other 1 from the 9/10 is the HV (High Voltage)
Diode that connects to the HV Capacitor.This is the cheaper fix of the
two with them being usually under $12. The Magnetron is rather high
ranging from approx. $50 and up.If you look on Ebay you generally can
find many replacement parts that are in good working order and save some
bucks.There are Magnetrons going for $18-25 on average and Diodes for
$3-12.If you have a rather loud HUM coming from your micro-it is then
generally the Magnetron.IF anyone does get inside their micro PLEASE
MAKE SURE TO GROUND OUT&DISCHARGE YOUR CAPACITOR Before doing
Anything! You can find the info to do it by searching on the web. There
is very much high voltage inside these EVEN AFTER you unplug it and can
hurt or kill, please note that.
Take care.
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The fan is not coming on. Does that change the situation?
The fan does not come on. Does that change the analysis?
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