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GE space maker jvm1640cj03 unit is not heating up at all

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  • deewillis3 Mar 21, 2011

    I have a over the range unit I know nothing about testing this unit it is not making a noise

    or getting any burning smell just not heating everything else is working

  • deewillis3 Mar 21, 2011

    will it be cheaper to buy a new unit than to replace the diode, high voltage capacitor or magnetron

  • deewillis3 Mar 21, 2011

    I can't pull the unit down to check the heating element or wires a repair person is coming tues I needed to be informed with some knowledge so I would not be taken advantage of I am a senior citizen seems like the heating element is a little more involved do you have any idea of the parts

    cost or what I should be paying for repair

  • deewillis3 Mar 21, 2011

    thank you very much I decided to put a shelf up and buy a counter microwave because the undercabinet one has its own dedicated outlet in the cabinet

  • deewillis3 Mar 21, 2011

    I am going to put a countertop under the cabinet how much clearance should be in the back of the unit since i will not have a fan

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  • Kitchen Ranges Master
  • 6,993 Answers

Hello,

Investigate these three areas if your JVM1640CJ03 won't heat

Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

Testing a diode

NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor.

Whether it is shorted or open, a defective diode will most likely show some sign of defect. Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. Also, it may have split in two, or it may exhibit a burned crack, or possibly even a blistered spot.

A shorted diode is indicated by a loud humming noise from the high voltage transformer, and no heat produced when a cook cycle is initiated. Whereas little or no heat produced in your microwave, with an absence of a humming noise is indicative of an open diode. In either case, the diode has to be replaced.

With your microwave unplugged, and your capacitor discharged, use extreme caution to remove the lead that leads to the capacitor. You can leave the ground connection attached. The side of the diode that goes to the ground is usually marked with a dot, stripe, or arrow. Set your ohmmeter to R x 10,000 or higher. Touch the positive meter probe to the anode and the negative meter probe to the cathode to measure the resistance across the diode terminals. Remember that the cathode is on the side that goes to the ground, which is often marked by a dot, stripe, or an arrow.

A normal diode, that is a non-defective diode, will read anywhere from 50,000 to 200,000 ohms. Differences in microwave make and model account for this large range in resistance readings.

Reverse the meter probes and measure resistance while touching the positive probe to the cathode and the negative probe to the anode. Reversing the probes like this should result in a reading of infinity. Unless a bleeder resistor is present. The presence of a bleeder resistor would produce a reading of the value of the resistor.

High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Testing a magnetron

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

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.

Read the tips on the below links on how to replace your microwave oven's diode and how to discharge the capacitor.

http://www.fixya.com/support/r7088355-replace_microwave_ovens_diode

http://www.fixya.com/support/r7088317-discharge_microwave_ovens_capacitor

Good luck.

Posted on Mar 21, 2011

  • 3 more comments 
  • Walesarumi
    Walesarumi Mar 21, 2011

    Hello again,

    In that case you will have to replace your heating element. Once the heating element becomes defective, the unit will not heat again.

    Also, there might be a wire disconnection as a result of heat coming out from the unit. The heat coming out from the unit can possibly melt the wire connected to the heating element, which can cause the unit not to heat any longer.

    So there are two things involved. 1 its either your heating element defective and needs to be replaced or 2. wire disconnection from the heating element as a result of heat.

    So, first, you will have to disassemble the unit, then check the wire connected to the heating element. If the wire is intact and you find no visible disconnection, then the heating element is the cause of the problem and it needs to be replaced.

    I hope you understand the above....

    Take care.

  • Walesarumi
    Walesarumi Mar 21, 2011

    Yes, it's cheaper to replace the diaode, capacitor etc.. These are component in the unit and they don't cost much..........

  • Walesarumi
    Walesarumi Mar 21, 2011

    Hello,

    if you cannot take unit apart to check the heating element all by your self, you can call a friend or family, with that you should get to the heating element.

    But if you will still be needing the repair person, you will have to stay with him/her and see all what is been done so that you won't be taken advantage of.

    The fact is, I don't know precisely the cost of the parts. But do a close watch at the repair person.........

    Take care...

  • Walesarumi
    Walesarumi Mar 21, 2011

    Okay, that's no problem since that's what you desire....... I wish you good luck.

  • Walesarumi
    Walesarumi Mar 21, 2011

    Hello,

    there is precisely no amount of space/clearance needed. All you have to do is to use your digression to leave some amount of space for ventilation.

    Take care.


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