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In our micro wave light becomes on when we start it but, not heated

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.



If it is the type with an "Invertor", they are not user serviceable and should be directed to an authorised repair agent for continued safety, otherwise if conventional;


Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Mar 28, 2011

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Posted on Jan 02, 2017

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Have a caso M30 micro wave, a year and a half old, doesn't heat any more


test this steps and fix it. God bless you

  1. Check the power diodeThis electronic component is responsible for transmitting current in one direction. If the diode becomes defective it will cause your microwave to not heat. Test the diode and replace it if necessary.
  2. High voltage capacitorResponsible for storing electricity, this part is a key component in any microwave. Remove, discharge, and test the capacitor to determine if it requires replacement.
  3. Damaged magnetronResponsible for generating waves and producing heat. When your microwave is no longer heating properly, replacement will be required.
  4. Thermal CutoffsExamine the thermal cutoffs on both the magnetron and the oven itself. Take off one of the leads and using a volt-ohm meter on RX1, check the terminals. If you get a result other than zero, replace the thermal cutoffs
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Oct 24, 2013 | CASO Microwave Ovens

1 Answer

Try2910227 serial ywmh2205xvb-0 model arcing on the back corner were the rack sits.Is there a way to repair this seen is the unit was purchaced in June of 2011.


Yes, take the rack out and recycle it. I do not know why these micro-wave company put racks in the micro wave ovens. You get some insulation on the inside the micro flaking off next the rack.


The mega-tron tube is a very high energy transmitter. The energy will come out of the top inside the micro wave oven in a wave guide. Micro wave energy that generation by the tube is high frequency into Gega Hertz. You have a metal tray in side the micro wave acts like a big capacitor it stores energy in form of heat the next you know it look like Marconi is putting on a lighting display.



Leave the wire tie on a loft of bread and put in you micro wave oven to defrost. The next thing you might see is a load bread burning, instant toast. ----The use of micro wave were invented by the British before WWII. The mega tron tube generation very high frequency radio wave and these wave struck an object 100 miles away some of this beam energy would balance back to a receiver-----You have Radar.... I wish you and your family well being and be careful of micro wave ovens it can burn from inside out. GB you...stewbison

Aug 22, 2011 | Microwave Ovens

1 Answer

My microwave starts however food does not heat up.


Micro wave as the name suggests produces heat when the micro waves aimed at an object causes the water molecules inside the object to vibrate hence producing heat.The gadget responsible is the magnetron. If your magnetron is not receiving ht voltage or receiving but faulty, then your micro wave wont work please take precaution when opening micro wave due to high voltage caps that remain charged sometimes even when it is off.check the high voltage fuse/ diode and capacitor if they are fine and the step up trans former o.k then the only option is to replace the magnetron

Aug 02, 2010 | GE JVM1790 1000 Watts Convection /...

1 Answer

Why would my microwave no longer heat or cook?


micro waves use a tube inside that generates micro waves and like a light bulb they eventually blow out. the tube is not considered replaceable and cheaper to just get new unit.

Apr 23, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Micro wave stopped heating. All other features


Check the door safety interlock switches. Magnatrons are pretty tough but the little switches are not.

Mar 24, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Micro is turning on ok and working but not heating up,what would cause that? light is on ok and plate is turning, just not heating


How old is your m wave? Sounds like you need to replace it .You can get a new one from Wal mart for under 75.00.and that will get you the big 1 sq.ft one..I once broke the plate in my m/wave and believe it or not they wanted more for the new plate than I paid for the M/wave BEFORE you do that check your power level settings perhaps it was turned down

Jan 28, 2010 | Sanyo EM-G2585W Microwave Oven

1 Answer

Amana aco 1840 over stove micro wave. heating not working .


FIK IT THE HEATING ELEMENT IS STRIGHT FORWORD AND COST IS CHEAP, GO FOR IT .

Oct 24, 2009 | Amana ACM1580 Convection Microwave Oven

1 Answer

Boiling waer under micro wave lots of steam into micro wave, turn on micro wave ,pop noise like glass miro wave comes on louder hum than normal no heat


Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
 Q - My microwave is running and sounds like it is working but will not heat up anything.
A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.

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