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Frigidaire, FMT148GPB1 microwave Every works except it will not heat anything I assume it is the magnatron Is this magnatron for sale, can it be replaced, and what does it cost

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My microwave dont heat

Posted on Aug 20, 2011

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Posted on Jan 02, 2017

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I just installed an over the range Magic Chef microwave and all controls seem to work properly however, it will not cook or heat anything. Am I correct in assuming the magnatron is faulty.


Sometimes there is a separate fuse for the magnatron circuit. Sometimes the fuse is the culprut, and sometimes it is the control board. Usually when magnatrons fail, they smoke or go bang or both.
I would look for a blown fuse first, and then look for a factory authorised service center.

Best of luck.

Jan 20, 2010 | Magic Chef MCD1311ST Microwave Oven

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Everything else works but will not heat anything. Clock works,glass plate turns,exhaust fan runs, lights work, just no heat.


Im assuming you dont have testing equipment. The best solution is to replace the capacitor and HV diode. Good chance that is the problem. If no heat still, replace the magnatron, definately will work correctly.(Sorry, to much to explaine otherwise relating to measurement and values). Let me know if still notright).

Sep 27, 2009 | GE JVM1410 Microwave Oven

2 Answers

Over the range Frigidaire Microwave not heating. Model FMT148


This is a sure sign that the MAGNATRON needs replaced (this is what heats up the food) if every thing else works but food not cooking! 99% of time it is the magnatron!
Please rate answer!
THANK YOU!

Jan 12, 2009 | Microwave Ovens

1 Answer

Frigidaire Microwave will not heat and is a little louder than usual.


High voltage parts are suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing either the magnatron or the high-voltage capacitor and diode. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

Jan 11, 2008 | Frigidaire GLMV169D Microwave Oven

2 Answers

Everything works except it doesn't heat anything


no, just 1 main fuse for everything. there are temp safety devices though, and door closed safety switches. Most likely failure though is the magnatron.

Dec 30, 2007 | Kenmore 64002 Microwave Oven

1 Answer

Microwave won't heat.


Magnatron is suspect. Need to put a voltmeter and see if the input (primary) side to the high-voltage transformer (big heavy iron thing in there) is getting 120Vac. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing the magnatron. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"

Dec 30, 2007 | Maytag UMV1152BAS Microwave Oven

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