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My microwave will not cook anything but turns on like it is. the fan doesn't always work right either

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Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

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Posted on May 20, 2011

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Posted on Jan 02, 2017

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1 Answer

Everything on microwave works except it doesn't heat or cook. what is the problem?


IT'S THE MAGNITRON - CHEAPER TO BUY NEW THAN REPLACE - SORRY.

Jan 09, 2013 | Microwave Ovens

1 Answer

Microwave not working


see this causes and fix it. God bless you
If the microwave will not work at all, make sure power is on at the outlet and test the electrical cord. Test the fuse and replace it if it is faulty. Also check the door to make sure it closes properly. Test and, if needed, replace the fan.
If the oven doesn't cook or cooks only intermittently but the display is on, check the door interlock switch, the thermal cutout , and the fan replacing parts that don't pass the test.


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Oct 16, 2012 | Kenmore Microwave Ovens

1 Answer

Micrwave not working


see this causes and fix it. God bless you
If the microwave will not work at all, make sure power is on at the outlet and test the electrical cord. Test the fuse and replace it if it is faulty. Also check the door to make sure it closes properly. Test and, if needed, replace the fan.
If the oven doesn't cook or cooks only intermittently but the display is on, check the door interlock switch, the thermal cutout and the fan, replacing parts that don't pass the test.

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Oct 16, 2012 | Microwave Ovens

1 Answer

Advantium 120 not working


see this causes and fix it. God bless you
If the microwave will not work at all, make sure power is on at the outlet and test the electrical cord. Test the fuse and replace it if it is faulty. Also check the door to make sure it closes properly. Test and, if needed, replace the fan.
If the oven doesn't cook or cooks only intermittently but the display is on, check the door interlock switch, the thermal cutout, and the fan, replacing parts that don't pass the test.

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Oct 15, 2012 | Maytag MMV1153A Microwave Oven

1 Answer

Sharp convection microwave oven model R1875F. It's cooking on the left side faster then the rest of the oven. It seems to burn on the left side and not cook in the middle.


see the next causes. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.

High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
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Oct 03, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Why it's not functioning?


see this causes and fix it.
God bless you
f the microwave will not work at all, make sure power is on at the outlet and test the electrical cord. Test the fuse and replace it if it is faulty. Also check the door to make sure it closes properly. Test and, if needed, replace the fan. If the oven doesn't cook or cooks only intermittently but the display is on, check the door interlock switch, the thermal cutout (see the Applaince Controls Fix-It Guide), and the fan, replacing parts that don't pass the test.
If the oven keeps blowing fuses, check for a faulty door interlock or monitor switch.

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Oct 02, 2012 | Microwave Ovens

1 Answer

R-820js wont heat


see this causes and fix it .God bless you
f the microwave will not work at all, make sure power is on at the outlet and test the electrical cord. Test the fuse and replace it if it is faulty. Also check the door to make sure it closes properly. Test and, if needed, replace the fan. If the oven doesn't cook or cooks only intermittently but the display is on, check the door interlock switch, the thermal cutout (see the Applaince Controls Fix-It Guide), and the fan, replacing parts that don't pass the test.
If the oven keeps blowing fuses, check for a faulty door interlock or monitor switch.

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Oct 02, 2012 | Sharp R820JS 900 Watts Convection ...

1 Answer

Microwave exhaust fan doesn't really exhause any steam out. Model 721.80042700


The fan is for cooling the magnetron, nothing else. Steam remains in the cavity which is why the door should be left open after cooking to allow the steam to evaporate.

May 30, 2017 | Kenmore 30" Microwave Combination...

1 Answer

Microwave won't work, I was cooking on the stove and the fan came on and then everything went out on the microwave suddenly


There is a thermostat which detects when the temperature from the cooktop is too high, and it makes the hood vent exhaust fan come on to cool it to protect the controller.

That's I always recommend that you use the vent fan whenever you're cooking on the stove top to keep heat, steam, and grease out of the controls and door panels.

Assuming the wall outlet is good, the first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

If it's still dead, another thermostat may be blown,or the fuse.

You can find links to helpful exploded view diagrams and order parts here.

I'd recommend that your bookmark this link to your favorites.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Usually the fuse and magnetron thermostat will be accessible for testing behind the controller.

If those are good, then it may be a bad oven cavity thermostat, and checking that will require you to remove the oven from the wall and take off the outer cover.

Behind the controls in many microwaves is a technical sheet, which helps in locating and testing components.

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

Nov 02, 2011 | Magic Chef MCO160UQ Microwave Oven

2 Answers

Kenmore 721 microwave fan turns on by itself


I have the exact same problem with my Kenmore Microwave model 721 that we bought in October of 2005. The Fan will just randomly turn itself on even when we are not cooking. It has been doing this for the last few months and is starting to become more frequent. There is no way to turn it off except to unplug it for several hours.
Was there a recall for this defect ?

Apr 25, 2009 | Kenmore Microwave Ovens

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