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Hi, my microwave doesn't heat up - Microwave Ovens

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  • Microwave Ovens Master
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This is not something that is easy to fix. You may need to take it in. There are parts that go bad and fuses that blow out.

Posted on Oct 21, 2013

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Sharp micro doesn't heat


see this causes and fix it. 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 02, 2012 | Sharp Microwave Ovens

1 Answer

Microwave wont heat up food


If your microwave runs, but doesn'theat your food, verify that you have selected a cooking setting. You mayaccidentally set the timer. Test the magnetron by placing 1 cup of water in themicrowave and heating the water for three minutes. If the water doesn't heat,your magnetron is dead.

Mar 08, 2012 | Sanyo Microwave Ovens

1 Answer

Microwave sounds normal but doesn't heat and shuts off after about 20 seconds.


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

Microwave Oven Basic Troubleshooting Tips

heatman101

Aug 11, 2011 | Panasonic NN-S560WF Microwave Oven

1 Answer

Our Whirlpool Microwave Oven makes a loud winding noise and doesn't heat.


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

Microwave Oven Basic Troubleshooting Tips

heatman101
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Aug 01, 2011 | Whirlpool MH6150XLS Microwave Oven

1 Answer

Microwave runs but doesn not heat


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

Microwave Oven Basic Troubleshooting Tips

heatman101

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Aug 01, 2011 | Goldstar MA-1012 Microwave Oven

1 Answer

Microwave has crackling sound when plugged in. Doesn't matter if heating or not...sound there all the time. I have to unplug and only plug in when needed to heat items.


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

Microwave Oven Basic Troubleshooting Tips

heatman101 [
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Jul 20, 2011 | Magic Chef MCM660A Microwave Oven

1 Answer

Microwave works but the heating portion doesn't work


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

Microwave Oven Basic Troubleshooting Tips

heatman101 ',;./

May 29, 2011 | Frigidaire 1.6 Cu. Ft. Over-the-Range...

1 Answer

Doesn't heat up but everything works


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

Microwave Oven Basic Troubleshooting Tips

heatman101 ';'
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May 18, 2011 | Emerson Black Microwave Oven

1 Answer

How to fix an Emerson microwave 8992RD that carousel doesn't turn and doesn't heat your food..


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

Microwave Oven Basic Troubleshooting Tips

heatman101

May 08, 2011 | Emerson Black Microwave Oven

1 Answer

MY MICROWAVE OVEN DOESN´T HEAT, HOW MUCH WOLD BE THE REPARATION?


Hi and welcome to FixYa. I am Kelly. The majority of the time when you have a working control panel and no heat there are 2 - 3 items that fail.

Service manual for this microwave is actually posted on the sears website:
http://www.searspartsdirect.com/partsdirect/part-model/Sansui-Parts/Microwave-Parts/Model-MW8554W/1763/0123245?pathTaken=


Cost will depend on what part has failed.

Kelly

Oct 05, 2010 | Samsung MW8554W Microwave Oven

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