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Microwave doesn't heat - GE Ovens

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  • s_dumas Oct 06, 2009

    I have a ge spacemaker xl1800. it makes a slightly different noise now when it starts, but doesn't continue as it runs. I have a pretty good general knowlege on electronics and I usually fix my own appliances, but I've never worked on a microwave. I removed the outer cover, and discharched the capacitor. I was just looking for pointers on what and how to test it now.

  • s_dumas Oct 06, 2009

    I have a ge spacemaker xl1800. it makes a slightly different noise now when it starts, but sound doesn't continue as it runs. The microwave doesn't heat food. I have a pretty good general knowlege on electronics and I usually fix my own appliances, but I've never worked on a microwave. I removed the outer cover, and discharched the capacitor. I was just looking for pointers on what and how to test now.

  • s_dumas Oct 07, 2009

    I discharched the capacitor and removed it. it seems to be physically leaking a little, and it doensn't really discharge when the connections are shorted so i'm ordering a new H V capacitor and diode. thanks for the info.

    Scott


  • s_dumas Oct 07, 2009

    thanks dmftrucker. you were very helpful.

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  • GE Master
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If it still turns,but no heat, your H.V. diode, H.V. capacitor, or magnetron tube are at fault,the first 2 items are rather inexpensive, but the magnetron tube can get pricy i.e. $75-$100+

Posted on Oct 07, 2009

  • daniel  hendrickson
    daniel hendrickson Oct 07, 2009

    scott was this the problem then? if its leaking that needs to be replaced anyway,there may be pcb's in that cap if its leaking,most new caps are dry or have a non leak paste.good luck again thanks dan

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If a user sets up a microwave and turns it on, one would expect it to heat the food in it. If it doesn't, it has probably developed an electrical fault. But that's probably obvious. If the unit has a touch panel and the display is not functioning and the unit is totally dead, it might be a fuse (but it may not). Listen to the Mechanic on this one, friends. Even taking a unit apart to replace a fuse can be exceptionally dangerous. Very dangerous voltages delivered at high current make a microwave work. How much value do you put on your life? You been warned, ait?
If the display is lit, the fuse in the microwave is good and a blown fuse is not the cause. (A blown fuse kills everything including the display and clock. It will act as if it wasn't even plugged in.) If everything comes on when it is started, like the light in the cavity and the fan (which one can hear running), and the timer counts down but it doesn't heat, the problem is probably isolated to the high voltage section of the oven. If the display is on and the oven won't come on and run, there may be a problem in the door interlock system or the thermal protection system. The cited symptoms and possible causes are general and some slight variation may exist in a specific machine. But the bad news is the same. It's this: there isn't much a user can do to fix the problem without exposure to extreme hazards. There are dangers lurking inside the metal box we all use so frequently (to the point we just about take it for granted). And they can be fatal. Don't even think about trying to repair a microwave. Be smart and be safe. The life you save may be your own.

Posted on Oct 06, 2009

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  • Master
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Hi,

when you try to reheat something does everything "sound" like it's working correctly? It's just not heating?

If yes,

This usually means that your magnetron is shorted. The magnetron is the part that actually produces the microwaves inside the oven. It's not safe to change this part by yourself if you never have worked on a microwave before because the magnetron can hold a charge of 3000 volts if not discharged properly.

unless let me know along with make and model of the machine.

Thanks.

Posted on Oct 06, 2009

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