Microwave seems to turn on when door latch is opened
Question for microwavesvc and others:
I have a ge jw740 microwave with a push button door opener. By accident, I noticed that if I push the button halfway (before the door actually swings open), the microwave light, fan, and turntable come on suddenly. I can't tell if the microwave is actually heating, or if it's just the light, turntable, and fan that are working.
I don't exactly understand the physical relationship between the door switch and the door latches, but why would this happen? As I depress the button to open the door, shouldn't all functions except for the interior light be automatically shut down? I'm just trying to find out of this is normal or not, or whether there is some malfunction that I should be concerned about (I don't want the microwave accidentally turning on in the future as the door is completely opened). Thanks in advance.
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Re: microwave seems to turn on when door latch is opened
What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on.
The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent.
Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second.
That's perfectly normal.
The relay on the control board must also be turned on before it will actually be cooking.
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One of the latches may be bent/misaligned
and is not lifting the other latch clear of the housing. Remove from
any power source, remove the cover of the cabinet. Slacken off the
clamp mechanism and ease the clamp over the guide to allow the door
to open. When a new door lever is in place, the door may be easily
adjusted by slackening off the screws that clamp the door
catch/actuators in place whilst holding the door closed and then
tightening the screws. The rear of the door may be adjusted by
slackening the lower door hinge screws and adjusting as required. I
hope that helps.
Do not pry the door open since there is an easier remedy which will lead you in the direction that you need to fix your problem. Take the cover off after you disconnect the power to it. Once you have taken the cover off (only a few screws) you will be able to see the two latches that hold the door closed and the link that opens both of them. You can just lift both latches at the same time and it will open. After you have done that take a good look and press in on the open door button and you will see where you have the problem of the door hanging. That button should push a linkage that pushes up on both latches at once to open the door. It is spring loaded so that it comes back down so that when you close the door it will hold the door close.You need to take the cover off the microwave so that you can pull both of the latches that hold the door closed up. When you push the button in it engages a linkage that pushes both taches up at the same time to open the door. It is springloaded and will come back down during normal operation to hold the door closed when you close it again. That area is where your problem is. By looking at what happens when you press the open door button you should be able to readily see where the problem lies in that linkage
I suspect that the lower door latch has broken off. The lower hook is actuated by the push lever and in turn lifts the upper latch that of course is not being lifted. Disconnect from the supply. Remove the case from the microwave and you will see how the door latch actuator works. Lift it manually and you can open the door. Do not try and use the appliance in that condition as it will take out its mains fuse as the door switches and latches for a safety interlock. Hope this helps.
You need to replace the whole door latch with an original part.
If it is working but not heating, then test the high voltage
capacitor,the rectifier diode.or the magnetron. If all this are fine,
test the control board.If turntable is not running check also the door
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.
Most microwave ovens have catches that are shaped like hooks, these hooks catch on a fixed bolt or a raise in the frame of the oven.
The next time you get the oven open check these hooks to see if the springs are working in a strong positive manner, or if you have to push a button on the model check to see that the button releases the hooks.
The problem appears, at least in part, to the door latch circuitry which cannot be serviced by the owner. If the unit is still in warranty, call GE customer care. If not, replacing the unit is your best bet. I just bought a new GE 1100 watt oven with great features for less than $100 If the door dosen't latch correctly, you could be exposed to dangerous microwave energy.