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A word of caution.......if you are familiar with microwave ovens, you know how to discharge the big capacitor in the seconday-circuit, and what can happen if you don`t! BE CAREFULL!
If your microwave oven runs normally, but won`t heat, suspect a primary-circuit fuse. Always replace with a fuse of the same voltage and amp rating. Also, check all electrical connections. Again, be sure to discharge the big capacitor so as to avoid dangerous shock.
Another common problem and simple check is the power diode. Simply check for continuity. If you get continuity in both directions with a volt-ohm meter, replace the power-diode.
If you have the proper meter, check the secondary-circuit capacitor. The capacitor can be a little pricey if it is bad.
If that doesn`t do it, the problem is likely the primary-secondary transformer. Unfortunately, the cost of the replacement part is probably more expensive than buying a new microwave oven.
Sounds like there could be a potential problem with your magnetron, capacitor, or control panel inside of your Frigidaire microwave and that is why it is not heating. I would recommend seeking assistance from a professional for additional assistance towards a proper diagnose of your appliance. -Matt
Unplug, remove top, look under keypad, follow wires to circuit board, look for a silver rectangular capacitor, "may be under a plastic flap" discharge capacitor with a screwdriver across the 2 points, look for a small fuse near by in clips, remove and replace with same current rating, assemble before test because lethal voltages present when powered.
More than likely it's the magnetron and/or diode, chances are it may
still be under warranty. Online owners manual states 5 year warranty on
magnetron. Part only, service call and installation not included. Diode
not covered. They require serial number, and will let you know if it's
still under warranty. Installation appears to be simple, UNPLUG
MICROWAVE THEN MAKE SURE YOU DISCHARGE CAPACITOR. INJURY OR POSSIBLE
DEATH IF NOT DISCHARGED PROPERLY. Google how to install magnetron and
discharge capacitor. It will save you approx $ 250 - 300 doing it
yourself. Hope this helps. Be Safe
either your hi-voltage diode,capacitor or magnetron are defective,if your not electrically savvy,don't open the unit up, by hi-voltage i mean the cap can store up to 2,000volts a.c.appx 18 times whats at your plug in receptacle,if you do tackle it,make sure to completely discharge the cap before attempting any repair...gooid luck and be safe
You have not mentioned the model and make of the oven. You can check if
there is a fuse between the highvoltage winding of the transformer
andthe capacitor. If it is blown off replace the fuse, or you have to
replace the magnetron.
Disconnect the connector to the primary winding of the high
voltage transformer. Put a new fuse . If the fuse is not
blowing the problem may be in the secondary side of the high voltage
transformer. Chek the highvoltage diode, capacitor,
magnetron respectively. you can also check the primary winding of the
low voltage transformer.
Confirm 110-120 volts AC is entering the primary coil on the high voltage transformer....meter works but can be fooled, I usually rig up a light socket and household light bulb and hook that to the 2 input wires for the transformer and see if the light works or not when you run the microwave....can even set a power level and watch the light go on and off. Discharge the capacitor first before attempting any checks or tests.
Scary but works!....
If ok, put those 2 wires back on the transformer. Discharge the capacitor . Remove the 2 wires going to the magnetron....run the microwave a few seconds ( 2-3 ) and remove power....again discharge the high voltage capacitor . If you got a good crack&spark when you discharge the cap the second time you are creating high voltage but not using it ( bad magnetron or loose High Voltage wire somewhere )....if you get no crack&spark you are not creating high voltage.
How to check a common high voltage diode - click here. Check the diode with one end off/disconnected....should show continuity one way, reverse your meter leads and none the other way.....many meters are not high/good enough and often show no continuity ( infinity ) in both directions. A full continuity reading in both directions (0 ohms) on the diode may be shorted/bad one! Many microwaves however have a defect in the microwave distribution system which causes the magnetron tube to overheat and cut out and/or damage the diode.
You say that Everything went out at first ( which I assume means that all functions went dead) and then functions started to operate again later... if that is correct and you smelled something burning.. you may have a thermal fuse that failed, filament transformer that failed, magnetron tube that failed or a highvoltage capacitor that failed.. None of these components are something the untrained person should attempt to trouble shoot or replace since there are dangerous energies stored inside the electronics compartment even after power is removed.. Your Micro is > 8 years old and it's probably not worth the cost of repairing at this point. You'd be better served replacing it.. The cost to repair would exceed the cost to replace.. ( I feel like the grim reaper here..sorry..)