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Magnetron replacement Can or should a customer replace his own magnetron

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On Certain conditions, they must have a basic knowledge of what they are doing, save your loved ones the cost of a funeral and buy a $50 print on microwave servicing to learn mainly how to discharge a high voltage capacitor, which store a dangerous amount of voltage. as long as the magnatron is of the same dimensions and vents, screws all go in the same way as well,certain models require the same value magnatron, some dont. Good Luck.

Posted on Nov 27, 2008


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I have a 6 year old GE overstove Spacemaker XL 1800 microwave. Every function works fine on the electronic panel except it does not heat anything up. I have the schematic and flow chart from inside and a...

Hello there,

You are right that the problem is from the magnetron, it is defective and need to be tested and replaced. Since you have a multitester, you will be needing a ohm meter, here are the steps to testing and replacing the magnetron.

To test the magnetron, please follow these steps,

NOTE: Before you test this component, make sure your microwave is unplugged, and that you have discharged the capacitors.

There are two tests to conduct in order to determine whether or not a magnetron has become defective. If you receive results other than what are detailed below, you will have to replace your microwave's magnetron. Each test is described for you here:

TEST 1: Locate your magnetron and label each of the wires attached to it so that you know which wires are to be replaced where. Set your ohmmeter to the lowest resistance scale. Take a resistance measurement between each of the magnetron's terminals by touching each probe to one terminal each. Reverse the probes and take a second resistance measurement. Each measurement should read less than one ohm.

TEST 2: Set your ohmmeter to its highest resistance scale. Touch one of the meter's probes to a magnetron terminal. Touch the other probe to the metal magnetron housing. Take special caution to not touch the two probes together. This could result in an inaccurate reading. This test should produce a reading of infinity - indicating an open circuit.

To replace the magnetron

Have a certified and experienced appliance repair technician examine and replace your magnetron. This task is much too dangerous for the average layman to perform on his own

Hope this was helpful you.

All the best


Oct 22, 2011 | Microwave Ovens

2 Answers

Hmv9305/01 microwave @ 13months old the magnetron blew, authorized bosch repairman, replaced using bosch magnetron. warranty for 90 days jan of 2011 same problem, why does this happen? should i ditch...

With all due respect, what are you doing to it?
If you use it with nothing in the cavity, that will kill the magnetron otherwise it will last for years and years.
Very unusual and Bosch is a well respected name.
If there is a probem with the oven, Bosch will replace it so take it up with Bosch.

Apr 01, 2011 | Bosch HMV9305 Microwave Oven

2 Answers

Smelled like something was burning and stopped heating. Turntable and lights work

March 2012 - GE does not support customers mad.gif

I have GE microwave with a failed Magnetron. It is emitting large sparks. Upon removing the magnetron I found that the sparks left residue where they are leaking from the cylindrical shaped piece on the end of the Magnetron.

The Magnetron is under warranty.



I called GE PARTS, GE support and GE consumer relations department. They changed their policy two weeks ago and require a service technician to replace the part.


Since I already removed the part the service technician would have to put in 3 screws and plug in the cable...FOR $220...I PAID $229 FOR THE MICROWAVE NEW!!!!



Further research:

GE Microwaves can spontaneously turn on and start a fire - see Consumer Reports web page here:

Further evidence GE retroactively changing their warranties:

Nov 30, 2009 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

Our Sanyo Microwave Oven barely 14 months old refuses to heat anything.The electrics are fine, the Clock works and the turntable turns. I have requested help from your customer services and Argos from whom...

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron. You will need to remove the cover to expose the magnetron, and other components. I recommend calling for a service tech if you are not an experienced electrician. You will need to test the cut-off fuse to confirm magnetron failure.)))

Oct 26, 2009 | Microwave Ovens

1 Answer

Magnetron is broke eb verything works but no heat

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Aug 08, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

Microwave will not heat food and is noisy

Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Apr 28, 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

1 Answer

Cutting off and on

Sadly, we hear of this over and over.

This is due to a defective or loose magnetron causing electrical interference and disruption in the control circuit board.

If your magnetron was recently replaced, it may have loose mounting nuts or bolts or maybe the wire mesh RF gasket was not installed or got pinched.

It may also need a new high-voltage diode and stirrer, and the cavity may be affected.

Details are in their bulletin here. Even if your model is not on the list, the same problem can occur, requiring a kit.

If a technician just replaces the magnetron and not the kit, the problem can recur.

It can also happen again if the technician used an old style defective magnetron from his stock that he thought was good to use!

GE Customer Service is here. I'd contact them, and I'd check to see if the servicer saw the bulletin and if he used a NEW style replacement magnetron!

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

Sep 26, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Loud vibrational noise

First of all, if the metal of the waveguide above the magnetron is compromised, the oven would have to be scrapped.

If it's intact, then it can be cleaned and sanded thoroughly. Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

In some models, there were "underperforming" magnetrons which had to be replaced along with stirrers (antennas) and high voltage didoes that also had to be replaced to electronically match the new type magnetron.

If this is the case, your "new" magnetron may not be the new type, but an old type, so the problem would just repeat.

Some suppliers and repair centers may unknowingly keep old version parts in stock.

I would check back with the servicer or supplier, but your magnetron should have a 5 to 9 year warranty.

If it is a design defect, there may be a recall or "campaign" under which you can get this taken care of.

I would call Sears customer service.

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

Jul 28, 2008 | Kenmore 62642 / 62644 / 62649 Microwave...

4 Answers

GE microwave replacement magnetron

I also have a HotPoint (GE) Spacesaver Microwave Oven (MWO)that we got at Home Depot about 3 yrs ago. The magnetron quit yesterday and I found out online that this is a common occurance with GE MWO's. I found this string and thought I would attempt to have GE send me a magnetron to replace the defective original part.

I called Customer Relations (1 800-386-1215) and spoke with Nikita. I informed her nicely that I was aware that this is a common problem with GE MWO's and that I am a Union Electrician who would like to perform this repair myself. I simply needed the replacement part. She was very understanding and asked for the model and serial number and after a few minutes she supplied me with an order confirm #.

The part should arrive in a few days via FedEx and we will be back into space age cooking and also our appliances will still match. Thanks to all who posted to this string and clued me in (You have saved me a C note!).

David in Omaha

Jan 26, 2008 | Microwave Ovens

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