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Transformer heating up and huming sound is

Transformer heating up heavely and huming sound is comingin cood checked all parts looks ok normal heatingbut i feel if i run for 10 minutes tranformer will burn out

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This could be caused by one of the following.

You may have a diode that is breaking down causing a higher than normal draw on the transformer. You can test the diode with a good ohmmeter, you should get close to 0 resistance one direction and very high resistance the other.

Either the secondary winding or the filament winding on the transformer is partially shorted. If this is the case it will burn out fairly soon. To check use the ohmmeter again to get a good reading on the secondary and filament windings, compare these to the technical data on the unit.

Posted on May 04, 2010

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2 Answers

My microwave oven runs, but no heat.


The problem most likely is a faulty magnetron which produces microwave energy to heat the food.

Nov 20, 2011 | Hotpoint Microwave Ovens

1 Answer

My micro-wave #WMH 2175XVS1 will not heat. All other fuction appear normal. Technician loked at it and said he needed to replace the transformer, magnatron, diode, capacitor. all cost more than a new unit....


I have a hard time believing that ALL the high-voltage parts would be bad at one time, especially the transformer. That's a part that almost never goes bad. I don't think I'd trust the tech's diagnosis.

However, a bad door switch will keep the oven from working properly, so the tech is right about the trouble being in the magnetron or its associated parts. This doesn't mean they are all bad, though. The most common failure is the magnetron itself, which can burn out like a light bulb. Then everything appears to work but there's no heat. I think the tech who looked at your oven may not have known how to check the individual parts, or didn't want to take the time to check, and just decided to tell you they were all bad. If they really are, it's certainly less expensive to buy a new oven.

The trouble could be in the control circuit board or connections to it, so it doesn't on the power to the magnetron power supply. I have seen bad solder connections and loose terminals cause no heating. You should have the oven checked over again by another technician who will actually checks voltages and test parts to determine what's wrong. It only takes a few minutes to do it right, and then you'll be able to make your decision to repair or replace the oven.

Mar 27, 2011 | Whirlpool Microwave Ovens

2 Answers

No heat


Hello there:
It sounds normal, but there's no heat When the microwave sounds okay, but there's no heat, one of the internal door switches, the high voltage circuitry, or the circuit board may have a problem. To resolve this problem, you need to test each of these parts with a multimeter and test for continuity generally no continuity during the testing means that the part you are testing is bad or is beginning to fail ok?
Hope this helps you out please feel free to post me a comment if you need any more testing help ok?
Best regards Michael

Jan 26, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Loud buzzing sound. Heats ok


may be the hi voltage . or a loose metal panel but its not normal and wiil probably lead to a failure like no heat . . most common would be a fan motor / high voltage / transformer / hope this helps **** ..

Jan 09, 2010 | Sharp R-403HW Microwave Oven

1 Answer

Maytag MMV4184AAW Microwave not heating


If you are looking to repair this yourself (along with assoceated risks) to cut test time in half the first test point would be to check for both live and neutral feed to the high voltage transformer. If you have both live and neutral here then the control circuit is working and the fault will lie within the high voltage circuit.

Hope this helps

Jan 07, 2010 | Maytag MMV5207AAS Microwave Oven

1 Answer

Our oven would not heat,everything appeared normal lights worked fan worked timer worked tried again on cook 3 closed door and lights went out and we have nothing,I have 120 volts at plug.


Check the voltage at the primary winding of the highvoltage transformer. If it is 120 volt.then controll board part is. Now check the magnetron and related components. If the fuse and the diode are ok replace the magnetron

Jul 14, 2009 | GE Spacemaker JVM1740 Microwave Oven

2 Answers

No Heat


ALL functions work.... just no heat? Is that right? I am assuming that the control (computer?, relays?) ARE supplying power to the magnetron.

IF everything checks out as you say, is the magnetron filament O.K.? (You have to disconnect it from the transformer to test it.)

If the magnetron transformer draws 8 amps, it sounds like it's O.K. cause if it was shorted, it would blow a fuse, and if it was open, it wouldn't draw ANY current.

Check it out, tell me more and let me know. No heat means the Magnetron isn't working.

Mar 30, 2008 | LG LRM1250 Microwave Oven

1 Answer

Won't heat. Everything else works.


Magnatron is suspect. Need to put a voltmeter on it 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 31, 2007 | Hotpoint RVM1435 Microwave Oven

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