Question about Frigidaire FMT148GP Microwave Oven

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Frigidaire fmt148 does not heat.The Magnetron and diode were replaced and it still does not heat. What else could it be?

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Posted on Jan 02, 2017

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drumbanger
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SOURCE: 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!

Posted on Jan 13, 2009

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  • 2 Answers

SOURCE: New GE Magnetron. Where does this new HV diode go?

Fixed it. There was a back capacitor fuse (I believe that's what it's called) on the old magnetron. I removed it and put it on the new magnetron. The HV diode is on the big silver capacitor and very easy to replace. I just didn't see it. It was definitely the magnetron and I hope that this new one comes with a warranty for 5 more years.

Posted on Dec 01, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Maytag MMV5156AAS Microwave won't heat and has hum/buzz.

A failed diode isn't the most common failure, but it happens. And sometimes it's due to bad magnetron or a bad connection.

If the capacitor fails, it almost always shorts, which results in a blown fuse whenever you hit "Start" to run the microwave.

The magnetron on this model should have a 5-year warranty, in case that's relevant. Your owner's manual is here.

We have the service / repair manual for this model and have uploaded it to our site here to help you.

It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)


http://www.gallawa.com/microtech/mag_test.html

http://www.gallawa.com/microtech/xformer.html

http://www.gallawa.com/microtech/cap_test.html

There should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

d:%5cele%5crepair%5cmicrowave%5cge_hotpoint%5cmini_manual_behind_grille_small.jpgdee77f7.jpg

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

You can find helpful exploded view diagrams and order parts here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Jun 30, 2009

freetek
  • 5568 Answers

SOURCE: Microwave does not heat

There is also very likely a fuse for the magnetron circuit as well. A failed magnetron could well destroy the diode that supplies the high voltage DC for it.

Posted on Oct 17, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: GE Spacemaker diode connection

A good high voltage diode will read open in both directions on a standard meter. See: http://www.gallawa.com/microtech/diode.html

If the diode is NOT shorted or burned looking, it's probably fine.


There should 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.

dee77f7.jpg

It has a wiring diagram and a schematic which shows you how the components are connected.

On one terminal of the high capacitor, there is only one connection - to the high voltage output of the high voltage transformer.

The other terminal of the capacitor will be connected to the high voltage diode and the magnetron, as well as one of the heater (cathode) windings of the high voltage transformer.

Here is info on testing the mag:

http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


You can find links to helpful exploded view diagrams and part ordering help here.

I'd recommend that your bookmark this link to your favorites.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 07, 2009

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If its the magnatron I suggest a technician

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Sanyo EM-SL40S microwave everything seems to be working fine but food doesn't get hot?


see this causes and fix it. GOD BLESS YOU
Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.


High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.


Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.


Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.
10_2_2012_12_38_27_pm.jpg10_2_2012_12_38_56_pm.gif

Oct 01, 2012 | Microwave Ovens

1 Answer

Microwave is not heating


There are three parts that will trigger this problem, the magnetron "common issue" or the high voltage capacitor and diode, if the magnetron is the problem it is cheaper to replace the microwave oven for a new one.

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1 Answer

Frigidaire microwave electricity works because the lights and timers work but the microwave does not heat. need assistance


There are few parts that will cause this problem, the power diode, defective high voltage capacitor, or the magnetron that heats food is a common failure, and the least likely is the high voltage transformer that drives the magnetron. Parts and labor will run high depending on what needs to be done, I suggest appliance repairman to see it it can be repaired at a reasonable price.

Jan 25, 2011 | Frigidaire Microwave Ovens

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My Frigidaire microwave is less than a year old. It is making a loud noise while running. So it runs loudly but does not heat up food. Is there a simple fix or did I get a dud?


The symptoms of loud noise and no heat indicate a short in the magnetron or high voltage diode. Need to take it to a qualified repair, to figure out what the problem. The magnetron replacement can cost as much as a new oven. See what the warranty covers, maybe you might luck out.

Dec 07, 2010 | Frigidaire FGMV174K Microwave Oven

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My Frigidaire microwave (PLMV169DCD) has recently stopped heating, but otherwise seems to work fine. I had a repair man come and look at it and said it was the magnetron. I purchased a used magnetron and...


A used magnetron is not a good idea at all to try and you can not test a diode with a digital meter. 99.9% of the time your transformer will start burning the wire windings when it fails. Also a magnetron can test good and still be bad. Without being there and looking at this myself the best advise I can give is to check the door switches, and if they are good just replace the Magnetron and Diode. You can order reasonably priced microwave replacement parts here http://allapplianceparts.com/. The mags they sell are better than most oem ones and are cheaper! You can also pick out a replacement diode from them.

Nov 13, 2010 | Frigidaire PLMV169DC Microwave Oven

1 Answer

Microwave won't heat, light ,clock works the microwave just won't heat the items in it.


hELLO THERE
when a microwave quits heating but every thing else is ok normally
investigate these 4 areas

Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
microwave_diode.jpg Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

picturena.gif High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

microwave_magnetron.jpg Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

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My Frigidaire over the stove microwave not heating food


Hi,It is most likely the magnetron and diode that has to be replaced. This job should be done by a tech, High voltage. Magnetron's normally have a five year warranty, check your owners manual.

Mar 20, 2009 | Frigidaire FMT148GP 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

I have a Frigidaire Microwave (Model GLMV169) that runs but does not heat. My son heard a loud bang the last time it was used. Any suggestions? Thanks


this will need to be looked at and tested , but it could be the high voltage capacitor , high voltage diode or the magnetron that will need replacing

electech

Nov 26, 2008 | Frigidaire Microwave Ovens

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