I dosnt heatup - Microwave Ovens

1. Open internal fuse
2. Magnetron failure
3. Control board failure
4. Door interlock failure

Magnetron thermostat is sensing over heat condition, it the fan running to cool it while running

Almost all microwaves have internal fuses. Counter top micros need to remove outer case and fuse should be near where power cord enters the microwave, Fuse looks like old style glass car fuses but is white or gray ceramic. Can't look at it to tell if its bad. Need tester. Over the range (wall Micros) usually have the fuse directly behind the control panel which you will need to drop down away from the body. Same type fuse as stated before. 15 or 20 amp should be stamped on metal edge. Purchase at Radio Shack or a parts store---or some Hardware stores.

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

I doubt that the switches are to blame - unless they have been damaged or had something spill inside them an accident or the like.

I found a wiring diagram for the internals of the appliance. You should consult it if you decide to look into the problem. Wires seldom fail along their length - but usually at a connection point. Knowing that, you could look around the inside of the stove but only if you unplug it first. Look for burnt or broken connections at the controls and anywhere they are indicated.. Repair or replace them as needed and reconnect as indicated by the schematic. I'm betting there's a break in a wire at / on one of the connections of a terminal strip or control switch.

Please rate this reply if helpful - good luck! Don't forget UNPLUG the stove before starting!

If it affects the taste of the food I would definately return it for a full refund before the 30 days are up.

It sounds like a failing magnetron. Sometimes they can be intermittent before they finally fail for good.

Chances are your oven has a 5-10 year warranty on the magnetron.

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A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

It may be a shorted high voltage diode.

Since it's less than one year old, it would be fully covered under warranty. I'd suggest contacting the manufacturer to get it fixed free.

You can contact Sharp at 1-800-BE-SHARP (1-800-237-4277) or visit them online.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

You probably have a new unit by now. The Magnetron part inside usually is the problem with this Maytag unit.I have had this unit blow the 'Magnetron' four times ! Everything else works fine. After watching the technician, I replaced it myself the other 3 times. The whole unit has to come out of the wall to do this. This High Voltage part is dangerous. The part costs about $100.00 from an online parts store. Partselect.com- or someone else.

Since you tested the door switches (my number one suspect) I would think you have a bad relay or a bad connection on the control panel circuit board. We repair these nationwide for $32.50, which is usually economical for most models. Just to make sure you have checked the door switches thoroughly, you can find my helpful text file called "doorsw.txt" via a Google search. It has important safety information and tips.