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Kenmore Microwave will not power up. Replaced fuse but it blows as soon as you try to turn it on.model no.: 790.47849406

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You have a dead short, It could be caused by a lot of things I would call Sears Repair.

Posted on Feb 28, 2009


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1 Answer

Microwave oven fuse blows

If your microwave oven is 7 years old or less, the too likely problems are the magnetron and the inverter board, if older check for a shorted high voltage capacitor and the high voltage diode, sometimes cracks and shorts.

Jun 13, 2012 | Sharp Microwave Ovens

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Sorry to read about your problem, I hope this helps you out.

you have a defective control board

I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

Dec 25, 2010 | Kenmore 63792 Microwave Oven

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Microwave blows fuse in microwave mode grill function ok

It is most likely the capacitor has shorted or the rectifier has shorted. Check with ohmeter, but make sure it is discharged first by shorting the capacitor with a wire.

May 21, 2010 | GE Advantium 120 Convection/Microwave Oven

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Kenmore microwave 80404400 no power

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.

Apr 20, 2010 | Kenmore 80412 Microwave Oven

1 Answer

Fuse blew microwave

Sounds like a fault on the magetron power supply.

If you are confident enough to ground and discharge the main capacitor, check to see if it is faulty.

Check for arcing or scorch marks around the transformer and check the HV lines on the magnatron input for continuity.

If the capacitor has blown out, this can be replaced, however if the magetron or transformer is faulty this is a much more complicated repair and should only be done professionally.

Mar 22, 2010 | Microwave Ovens

1 Answer

Panasonic NNA554W blows 10a fuse when microwave comes on

Possibly the interlock monitor switch is bad or out of adjustment. This switch is designed to create a short circuit across the power line (and then blow the fuse) if you attempt to defeat the door interlock and operate the oven with the door open. A shorted capacitor or diode could also cause the fuse to blow. Because of lethal voltages inside and the possibility of microwave leakage if repairs aren't done correctly, you are best off leaving microwave service to professionals.

May 15, 2009 | Panasonic NN-SN657SMicrowave Oven

1 Answer

Fuse keeps blowing.

couple questions -
what else is on the circuit,
and what current does the oven need

there are whirlpool over-range models with
1200watts of microwave,
1500watts of convection power, a
60watt bulb and a
375watt fan

over 15amps -20amp circuit needed

if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide reccommends 20amp
not a solution, something to check,

Oct 14, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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

Mar 21, 2008 | Microwave Ovens

1 Answer

Blown fuse

Be doubly sure your microwave is unplugged first, of course! Be sure the fuse is not loose in the holder. If you can rotate it in the holder easily with just a thumb and finger, then it's too loose and the holder should also be replaced. That looseness causes a heat buildup, which makes the fuse melt open inside over time. If the new fuse blows as soon as you hit START then you likely have a shorted high-voltage capacitor. If it blows again a few seconds or minutes after you hit START, then you likely have a bad high-voltage transformer or magnetron. It's not inherently unsafe to replace a fuse, as long as you heed the safety rules. The microwave does contain and prodcue voltages that can be instantly lethal. Feel free to see my safety info via my listing here on FixYa:

Dec 29, 2006 | Kenmore 80882 Microwave Oven

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