Question about GE JVM1440 Microwave Oven

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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

    DEVICE WIL NOT HEAT UP . THE OVEN IS BARELY 15 MONTHS OLD . NO ONE SHOULD BUY THIS MICROWAVE OVEN AS IT IS NOT RELIABLE .

  • minahuang Nov 25, 2008

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

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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

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1 Answer

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Check the door safety interlock switches. Magnatrons are pretty tough but the little switches are not.

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Check your door interlock safety switch. Unplug the device - remove the cover - DO NOT TOUCH THE SILVER THING IN A CAN. Look for the small probably black micro switch. Test it with a volt/ohm meter or contunity checker. It should read "closed" (or short) with the door closed and "open" with the door open. Replacement can be had from appliance or electronic parts store.

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A

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1 Answer

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Q - The microwave display counts down and the inside light is on,  but nothing is heating and the fan is not running.
A - This most commonly is a bad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common.
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A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay.....
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
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1 Answer

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this sounds like either a capacitor, transformer, or magnatron. Mags unually don't go bad. Either one can go bad and blow a fuse or other safety device. If one shorts, it could burn a section of the circuit board.

I would think about calling a tech and have him diagnose the problem. Tell him you can't fix it now but will in a month or two. Have him write down the things you need so when you do want it fixed, you do not have to start all over again. Then order the parts and fix yourself.

Micro waves can be dangerous and cause burns, so if you think this is not for you, go buy a new one.

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