Question about GE JVM1440 Microwave Oven

1 Answer

No heat from micro-wave

Everything runs except no heat, tested the fuse and micro switches one is no and one nc with out a schematic its difficult to determine procedure of operation. I think its the magnetron but not 100 %

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  • Anonymous Sep 02, 2008


  • minahuang Nov 25, 2008

    I have exactly the same problem with GE JVM1440 just after two years of usage.



1 Answer

Possible problems with this are: bad tube, bad diode, bad relay on the controller or bad Triac (if no relays) and the capacitor (the large silver one.) If the set runs but doesn't cook... then the door switches aren't the problem nor is the fuse.

Posted on Sep 07, 2008


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How can I obtain a service manual for KitchenAid microwave KHMS1850S,need wiring diagram to interlock switches.

Pulled up a schematic on this will try and help the first pic looks as though you removed the secondary switch the bottom one if so that is the wrong switch it should be a normally open switch that one is normally closed this switch goes up top on the other side of the primary switch the one with 3 terminals, look at the second pic the switch with 3 terminals that red wire in the wrong spot the skinny orange goes there the switch I just told you to put up top the red goes to one terminal the white and brown middle form the 3 terminal goes to the other terminal, the blue/white and blue go to the bottom switch this is a normally open switch if you don't know how to read a switch look at the switch look at com follow the line to where it stops if it is NO=normally open, NC=normally closed your primary switch is in the right spot you want the switch next to it to be NC and the bottom switch NO it blew the 20 amp fuse once you correct the switches and wiring and put in a new fuse if you have no power then it blew past the fuse and burnt out the filter board happens some times about 60 bucks let me know if this helps

Jan 25, 2015 | KitchenAid Microwave Ovens

2 Answers

Can the magnetron be tested

No, you will liley need to get it tested in a shop. How much would a new unit costs??

Sep 12, 2014 | Microwave Ovens

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Electrical wiring for mcd 1611st the microswitch the normally open and normally closed

Many micro switches have markings of "NC" and "NO" and "C" on them; indicating which terminal is what. You might be able to get a schematic for this on the Magic Chef web site.

May 06, 2014 | Magic Chef MCD1611ST Microwave Oven

1 Answer

Microwave stopped heating #mv1608bb

Open the back and look for a blown glass tube fuse. If the filament is broken, replace the fuse. If it's a solid fuse, do a continuity test. If you have continuity, then it is still good. Good luck!

Jan 17, 2014 | Goldstar Microwave Ovens

1 Answer

I have a GE Spacemaker Over-The-Range Microwave Model #JVM1533WD002 that has worked perfectly for 10 years. Now everything still works, except it doesn't heat the food. Where is the fuse located and how...

A common symptom of a failed magnetron is a failure to heat with everything else (magnetron fan, stirrer, timer, etc.) working fine. Check the GE manufacture date for the unit on its nameplate to determine the age of the magnetron. For GE models of the past, magnetrons had a 10 year parts replacement warranty. Magnetrons can be expensive, so you need to weigh all your options, i.e., repair versus replacement, before you commit to one solution.

Oct 04, 2013 | GE Spacemaker Over-the-Range Microwave

1 Answer

Whirlpool MH3184XP Microwave Turns On, Heats, but sounds like fans not working. 4 years old, fans worked fine until they seem not as loud anymore. The magnetron is working fine as it heats (did the 1 cup...

Suggest you pull the plug out, remove outer cover and place a cup of water into the micro. Set power to minimum then switch on and take note if the fan works or not. If not, switch off immediately and have it replaced(magnatron will burn out if left to run without fan.)

Sep 18, 2010 | Whirlpool MH3184XP Microwave Oven

1 Answer

It doesnt heat and is louder than normal


As I understand your question, everything works in your microwave except there is no heat, is this correct?

Typically there are two common reasons for no heat. The third is very expensive. I will cover the problems in order.

1) Do you regularly open the oven door while the machine is running? If yes, every time you open the door, the door safety interlock switch (a little micro switch) arcs at the tiny contacts. After a while, they become burned and are not able to complete the circuit that tells the oven the door is closed . . . door open, no heat. (forget what you know about the door being closed, the oven needs to kow)

2) There is a capacitor in your machine. They are very dangerous to work on if you do not understand their operation and the danger they represent. A capacitor stores power necessary to start the magnatron, the device that allows the heat process to begin. If mis-handled they can be lethal.

3) The mangnatron can be bad. This is extremely rare.

There may be other reasons for no heat complaint but lets deal with the first one first.

Remove the cover - don't touch the silver can (the capacitor) Look for the micro switches that are the door safety interlock. Find them opposite the hinge. Test them with a volt/omh meter. With the door closed the switch contacts should read closed. On some ovens, there are multiple switches and on some ovens one of the switches may read open. You will have to examine the switchs to see what they should be doing when at rest (normally open or normally closed).

If you cannot determine normally open or normally closed, you can still check the switches. If the door is open and the switch reads OPEN (the position of the contacts - no signal can pass open contacts), close the door. If it still reads OPEN - that switch is probably bad. Test all the switches (I have seen as many as three switches making up the safety device)

Modern capacitors are supose to drain their power within a certain amount of time rendering them safe to work on. There are many warnings against shorting the contacts of the capacitor to ground with a screw driver. The reason is it is a dangerous procedure unless done correctly (dangerous to the person holding the screw driver and possibly harmful to the oven).

A microwave repairman told me many years ago to use insulated pliers and remove the leads and reinsert them on to the terminals. He said this is frequently the reason the capacitor appears to be dead. He then did the procedure on my microwave and charged me $100.00 for the service call. The machine continues to work fine these many years later.

If your switches are fine and your capacitor is good (they are replacable (though dangerous if not handled with care)) the remaining main item is the magnatron. Unless you have a very expensive machine, it is probably not economical to repair this item.

You can find replacement parts at a advertiser or a appliance parts place in your area or visit

I hope I have answered your question and I hope you are able to get your oven going again. I don't know what we would do without our microwave! You probably feel the same.

Thank you for posting your question on

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Nov 09, 2009 | Emerson MW8107WA Microwave Oven

1 Answer

Everthing seems to work fan,lites,timer. but when you push the on button the microwave dosen't come on

I hear you saying everything seems fine with your oven except there is no heat action, Is that correct?

In my experience, the trouble can be traced to a faulty micro switch in the door safety interlock system as the #1 trouble.

Please remove the cover - use care to not touch the silver can - find the micro switches on the side away from the hinge.

You can test these switches with a volt/ohm meter in contunity setting. Test each switch independently.

What frequently happens is these switches become burned from arcing due to the door being opened while the oven is operating. The purpose of these switches is to tell the oven the door is closed and it is OK to turn on the magnatron. If the switch is burned, (fails to make a contact) the oven thinks the door is open, door open, no heat ... Make sense?

Find replacement switches at a advertiser, a local appliance parts place or at

This is not the only reason for a oven to not heat ... if this problem persists, please post a note here.

Thanks for using


Nov 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave stopped heating up the food. Everything works except for the heating mechanism.

Check the door safety interlock switches. Remove the cover to find these small micro switches on the side away from the hinges.

Need more help ... post a comment here

thanks for using

Nov 02, 2009 | Frigidaire PLMV169DC Microwave Oven

2 Answers

The microwave action not functioning, glass tray turning ok, oven light ok. Except NO heat.

The heat bulb is burned out you can look for the part at appliance parts pros . com to find your model and look to see if it is something you want to tackle. some are harder than others.

Nov 01, 2009 | Microwave Ovens

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