Question about Whirlpool MH1150XM Convection/Microwave Oven

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Which type of wire I should use to connect capacitor to magnetron

I recently replaced the magnetron but it turned out that the inputs are located at 90 degrees than the original one. Because of this, I need a longer wire that connects capacitor and magnetron. Since capacitor holds high voltage (or Wattage) current, I am afraid of using the regular electric wire. Any advise on which wire should I use and where can I find it?


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  • buskya2004 Dec 29, 2008

    Thanks for a link to high voltage wire. I couldn't find it no matter how much I googled. Regarding magnetron, it the same make and model (LG) as I read on sticker, but the connecotors are at 90 degrees than the original. I believe it must be used in different make and model. I got it for 15 bucks from eBay which would have costed me a lot from online retailers like AppliancePartsPros.

    Again thank you for providing a wire link.

  • buskya2004 Jan 04, 2009

    I got arching when I first put on the cover. I than put on the electric tape on both end of the wire. I also brought the liquide tape and painted it on the cover (thick coat). I than applied the electic tape on the top of paint. I am still not convinced. But I will give it a try. If this doesn't work either than I will go ahead and get the new magnetron.

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  • Whirlpool Master
  • 8,820 Answers

You were sent the wrong magnetron.

If the supplier will not give you the proper one, you can usually find helpful exploded view diagrams and order proper parts by entering your full model number here.

If you don't find it there, please reply back with your brand and model number so we can help you.

You would need high voltage wire, of course, but I would not recommend using the wrong magnetron in your oven since it is a critically tuned part, and will likely fail in short order if it is not the correct one.

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

Posted on Dec 28, 2008

  • William Miller
    William Miller Jan 03, 2009

    If you go ahead with this, be very careful.

    If you make a joint in two pieces of high voltage wire, be sure they're soldered and covered with heat shrink, then cover that heat shrink with a coating of silicone caulk and let it dry overnight.

    Also, be sure the terminals of the magnetron do not get too close to any metal.

    You don't want arcing at 3000V DC.

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I NEED TO KNOW TO CONNECT THE WIRES FROM THE TRANSFORMER CAPACITOR AND MAGNATRON


One side of the high voltage winding is usually connected to the frame of the transformer. Verify to make sure this is the case. The other end of the winding goes to the capacitor terminal that's not connected to the rectifier. There should be another high voltage wire that goes from the rectifier side of the capacitor to the magnetron. And, there should be two wires that go from the filiament winding on the transformer to the magnetron. The primary winding should be connected to whatever supplies 117 vac to it.

Apr 07, 2016 | Microwave Ovens

1 Answer

Model 721.64282 microwave/convection oven - microwave not heating and making a loud noise. convection oven works


No heat but otherwise normal operationA shorted HV diode, magnetron, or certain parts of the HV wiring would probably result in a loud hum from the HV transformer but will likely not blow the main fuse. (However, the HV fuse - not present on most domestic ovens - might blow.)
If the main power fuse is located in the primary of the high voltage transformer rather then at the line input, the clock and touchpad will work but the fuse will blow upon initiating a cook cycle. Or, if the fuse has already blown there will simply be no heating action once the cook cycle is started. There are other variations depending on whether the cooling fan, oven light, and so forth are located down stream of the fuse.

Some models may have a separate high voltage fuse. If this is blown, there will be no heating but no other symptoms. However, high voltage fuses are somewhat rare on domestic ovens.

A number of failures can result in the fuse NOT blowing but still no heat:


  • Bad connections - these may be almost anywhere in the microwave generator or the primary circuit of the HV transformer. A common location is at the crimp connections to the magnetron filament as they are high current and can overheat and result in no or intermittent contact. See the section: See the section: Testing the magnetron.
  • Open thermal protector - usually located on magnetron case. Test for continuity. It should read as a dead short - near zero ohms. See the section: Testing thermal protectors and thermal fuses.
  • Open thermal fuse - some ovens have one of these in the primary circuit. It may be in either connection to the HV transformer or elsewhere. Test for continuity. It should read as a dead short - near zero ohms.
  • Open HV capacitor - see the section: Testing the high voltage capacitor. A shorted HV capacitor would likely immediately blow the fuse.
  • Open HV diode - see the section: Testing the high voltage diode.
  • Open magnetron filament - This failure may also be due to loose, burnt, or deteriorated press (Fast-on) lugs for the filament connections and not an actual magnetron problem. See the section: Testing the magnetron.
  • Open winding in HV transformer. See the section: Testing the high voltage transformer.
  • Defective HV relay. A few models use a relay in the actual high voltage circuitry (rather than the primary) to regulate cooking power. This may have dirty or burnt contacts, a defective coil, or bad connections
  • Shorted HV diode - see the section: Testing the high voltage diode.
  • Short or other fault in the magnetron - see the section: Testing the magnetron.
  • Short in certain portions of the HV wiring. See the section: Testing and repairing the wiring and connections.

Depending on design, a number of other component failures could result in no heat as well including a defective relay or triac, interlock switch(s), and controller.


If you are interested in doing it yourself the following link will help : Microwave Repair Manual

(**All the above references to tests are found here)

Oct 21, 2010 | Kenmore 63663 Microwave Oven

1 Answer

My microwave is not heating up


If on switch on the light comes on and the table turns, then it is possibile the power board is working.
You will have to open the covers after removing the power. Inside is located the Magnetron fitted on the side of the outside cabon to radiate into the inner cabin. There is a high voltage that is necessary to activate the Magnetron. If this voltage is absent( must have a HT tester to confirm) please check the power capacitor for fault. You can test the capacitor and change if faulty..... short or no charge.
Please also check if relay click to give good contacts for connecting supply to the magnetron.
I hope you take care and precaution of high voltage/ radiation when the magnetron is working.
Also checck if any rodents have snapped out the wires to this section as it is over the range.
Hope my advice helps. please comment. Good day

Aug 19, 2010 | GE Profile Spacemaker Over-the-Range...

2 Answers

Hi, my microwave is not heating and i cannot hear any humming sounds either. I replace a new magnetron already and it's the same. What else could it be? do you think I should replace the capacitor, diode...


I would have started with the diode and capacitor (i.e the least expense) but you can check the diode by removing the input wire and doing a continuity check in BOTH directions. In other words check it then reverse the leads and check it again. It should only read in ONE direction. If it reads continuity in both directions or is open in both directions it is bad and must be replaced. If the diode check out fine then by all means check the capacitor. Just respect the fact it is a large capacitor and can really ruin your day if it is good and has a full charge. (Been there done that!) Take a screwdriver and ground across the terminals several times then note the position of the wires on the capacitor and remove the wires from ONE terminal set. Take your meter still on Ohms ( old simpson type dial meter for this test) and place it on the capacitors 2 terminals. Then rapidly reverse the leads and you should see a momentary jump on the meter then fall off. No jump when you repeatedly reverse the leads then the capacitor is bad. This should solve your problem unless there is a relay on the control board that controls the magnetron power.

Jan 16, 2010 | KitchenAid KCMS1555RSS Stainless Steel...

1 Answer

Wires to magnetron


It matters!

The wire from the high voltage transformer high voltage tap goes only to one side of the high voltage capacitor. No other wire is connected to that terminal of the high voltage capacitor.

The other side of the high voltage capacitor connects to the anode (A) of the high voltage diode and to the "FA" terminal of the magnetron.

The cathode (K) of the high voltage diode is connected to chassis ground.

The pair of wires connected to the secondary (thinner) winding of the high voltage transformer are the filament wires and are connected to the "F" and "FA" terminals of the magnetron.

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There should 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.

It has the overall wiring diagram and schematic.

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

For further free help, e-mail me at http://www.microwavecontrol.com

Jul 10, 2009 | GE JVM3670 Microwave Oven

2 Answers

Microwave runs but doesn't heat


If there is no noise at all, this suggests that the power transformer isn`t receiving power from the timer/control panel. If you do hear a little buzz when you operate the microwave, The timer/control panel is operating, However It could be a few things which if you are confident enough to tackle, could be sorted by you but bear in mind that microwave ovens can store a lethal amount of voltage which can kill, about 2000 volts for a year or so. Possible causes of your fault are the Magnetron, Power transformer, Capacitor, Diode or even the control panel that provides power for the power transformer if you don`t hear the buzz. Have you got a meter?? Yes? Switch it to X10 ohms. Next, Unplug from the power socket and remove the casing, discharge the high voltage capacitor with a pair of well insulated snipe nosed pliers covered in a thick dry towel. Next, place the meter leads between the capacitor where the thick lead enters, and the casing of the oven. Does the meter read anything? No? You need to find out if the transformer is receiving power from the timer/control panel. If it is, the Magnetron will be US or the heater supply is missing to the magnetron. If the meter reads, The diode/capacitor or magnetron is short circuit. Disconnect the thick leads which are connected to the capacitor, Check for leakage across the capacitor again, Yes? Magnetron OK. Some diodes are built into the capacitor. On models where the diode is visible, (A black device going from the capacitor to a screw holding it to the casing), either unscrew the screw or disconnect the connector on the capacitor, now read the capacitor connector, if OK, no reading, Diode US, If there is a reading, the capacitor is US. If there`s still no reading, read the lead which you removed from the capacitor which goes to the Magnetron, If it reads, the Magnetron is Short Circuit. To check the heater, connect your meter across the two connectors on the magnetron, If it reads, the heaters are OK, read across the two wires that you revoved from the magnetron, if it reads, the Transformer is OK, if not, a new Transformer is reqiured. If not, they are O/C, New magnetron required. I hope this helps, Ian

Jun 09, 2009 | GE JVM1420 Microwave Oven

1 Answer

It runs but does not heat


est the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Mar 24, 2009 | Panasonic NN-P794SF Microwave Oven

1 Answer

Microwave type icon comes on , microwave does not run


You cannot operate a microwave with door open because the radiation from magnetron is very dangerous for your health.

Regarding general microwave troubleshooting , see my solution below:

Test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

Thediode and capacitors can br tested. The capacitor must bealloweddischarge before testing, or you risk to get electrocuted, evenifpower is off. Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts. (here in UK).

Mar 12, 2009 | GE JE1860 Microwave Oven

1 Answer

Fuese blows


Yes, the most likely culprit to blowing your fuse is the magnetron itself. It is defective and causing an overload each time it comes on. If you do replace the magnetron replace the large electrolyctic capacitor (that is the big one that the magnetron connects to also) so that you do not have to do double the work. Alot of these magnetrons and capacitors are interchangeable as long as you can set them in place with screws. I do not what type of supply house you have but alot of people throw away microwaves with these parts still usable. Good luck.

Jan 22, 2009 | Microwave Ovens

1 Answer

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.

Nov 29, 2008 | GE JVM1631 Microwave Oven

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