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Microwave continues to run with door open

The original problem was a door error, I replaced the 20 amp fuse and when i restarted oven it would continue to run with the door open. A very scary condition.

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Most likely is that the door switch is stuck in the closed position allowing operation. Remove cover and find switch confirm its stuck w multimeter, replace.

Posted on Sep 07, 2014

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Posted on Jan 02, 2017

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I see other people talking about getting error codes on their Kenmore microwave. How do you get these codes my unit stopped working completley and the display is blank. I have been told to look into the...


Scott, if everything has gone blank on your microwave and you have no lights when you open the door, it may be the main fuse or even a tripped circuit breaker. Plug something else into the outlet to make sure that the circuit breaker is not tripped. If that is okay, un-plug your microwave and take out the screws that hold the outside cover onto the microwave and then remove the cover. Look for where the power cord goes into the unit and follow the black wire from the cord. It should go to either a small circuit board with the fuse located on it, or it may go to an in-line fuse holder. If you have access to a multi-meter, you can set it for continuity and check your fuse after you remove it from it's holder. If it is bad it will not show continuity. Replace it with the same amperage fuse that you take out. It will be stamped on one end of the fuse and will usually be either 15 amps or 20 amps. Hope this helps!

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Microwave stopped heating #mv1608bb


Open the back and look for a blown glass tube fuse. If the filament is broken, replace the fuse. If it's a solid fuse, do a continuity test. If you have continuity, then it is still good. Good luck!

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1 Answer

Microwave blows fuses


A short likely in the wiring for the light or at the safety switch embedded on the side where the door closes----be careful as a 20 amp fuse takes something major to take out.
(for it to blow)

This might be best left to a qualified service person.

Dec 22, 2012 | Microwave Ovens

1 Answer

I have a JVM1850 that was installed 4 years ago. The unit was working fine, then a day ago I received an error display requesting a charcoal filet replacement. No filter is needed since it is vented...


I have a JVM1850 White microwave-over the oven-installed 3 years ago. Last evening the unit would not turn off. The inside light and fan continued to run, however, the microwave was not working.

All the controls and functions seem to operate, but when completed, the unit remained working, as stated above, with the door opened or closed.

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The oven probably has a bad interlock monitor switch, one of several switches in a microwave that are operated by the door latches. The switch is wired so the fuse will blow if you try to run the oven with the door open, and it isn't operating properly when you close the door. As soon as the oven kicks on the power to the magnetron tube, the microwave source, the fuse blows. The switch may have been damaged if the door was slammed, or it's just a mechanical failure. It's not an expensive part, but any microwave repair involving the door should be done by a professional because of safety concerns, so you will have some labor cost to add in. It shouldn't cost as much as a new oven to make this repair, though, so it's probably worth fixing.

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1 Answer

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This is typical of the 20 amp fuse blown. It can blow due to slamming the door or even opening the door to quickly while it is running. It could also blow if there is a failure of one of the door interlock switches. This fuse is ceramic and looks similar to a cylinder automotive fuse and is located behind the control panel on this model.

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1 Answer

Viking Microwave Model VMOC205SS little over 4


9 amps is approx. correct. Does magnatron make an odd sound when running? If not, you will need to discharge cap then clean terminals with alcahol. Replace diode as well. Should run correctly.If blows again, replace magnatron. Suggest you put a 12 amp fast blow fuse in circuit and nor a 20 fuse.If you dont have a grill or an oven, use a 10 amp fuse.

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1 Answer

Microwave oven blowing 20 amp ceramic fuse


Chances are if the varistor fails, it fails drastically causing a short circuit across the supply. It will sit across the supply (it will look like a thick ceramic capacitor) and you can check for continuity after isolating that at one end. If it shows low resistance (it should show almost open circuit with a Digital meter), replace it.

It need not be the culprit. If you are familiar working with High voltage circuits ( they are lethal inside a microwave ovens as the current capability is high here), you can discharge the doubler capacitor and isolate the high voltage diode to check for shorts in the HT area.

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1 Answer

Microwave fuse keeps blowing


ckeck your door switches and h.v doides if you know how if do not get serviced by technician

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