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Kenmore 318279504a doesn't heat

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Kenmore elite microwave model 721.79203010 problems


I'd check to make sure you don't have a door switch that isn't functioning properly. Also, might be a control panel or control panel interface issue.

Mar 18, 2013 | Microwave Ovens

1 Answer

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 oven doesn't heat.


Yes! I have come across the odd case where the magnetron was intermittent, fortuneately it is rare because this type of problem is very difficult to nail down.

Jun 07, 2012 | Kenmore Microwave Ovens

1 Answer

Kenmore microwave elite with a F-9 code.


Get rid of your microwave. Studies have shown that microwaves change the molecular structure of the food, causing abnormal qualities and cancer. The inventor of the microwave doesn't use one.

Jun 05, 2012 | Kenmore 63662 / 63664 / 63669 Microwave...

1 Answer

We just installed a Kenmore 85600 over the range microwave. It is brand new in the box but we bought it from someone. We just got it installed and it doesn't heat anything. Does that mean the magn


Yes! it is a real possibility, or the inverter board is defective. Since it is brand new, have the person who you bought it from take it back to the place of purchase because he is the original buyer and the one with the warranty.

Apr 19, 2012 | Kenmore 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

Oven is not making etables heat


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 07, 2012 | LG Microwave Ovens

1 Answer

My Kenmore Built-in microwave doesn't heat and the turn table doesn't turn. Model 911-47812200


It is good that the microwave does not work all together. It might be an interlock button or even a relay connection burn on the main mother circuit board.

Need a qualified technician. The service manual will be like $20-50.

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Nov 22, 2011 | Microwave Ovens

2 Answers

Runs but doesn't heat replaced two fuses and magnetron still doesn't heat


Here is your free answer in under 10 minutes ...

You have a faulty door safety interlock switch. I wish you would have searched your problem here before you spent all that money on the magnetron. I have answered this question dozens of times here at this site.

When the oven runs but doesn't heat, more often than not it is nothing more than a faulty micro switch in the door latch system. When the switch doesn't work properly, the oven doesn't know the door is closed. If the door isn't closed, the oven will not energize the magnetron. Capacitors and magnetrons are **** and expensive answers but these items are extremely tough. It is the tiny contacts in the micro switch that can not stand the repeated abuse given them when we (read me in that number too) open the oven while it is energized causing a repeated flash across the contacts.

Thanks for your question @ FixYa.com

Aug 06, 2011 | Microwave Ovens

1 Answer

Kenmore Microwave won't heat.


your problem might be more than a fuse chech the magnetron

Sep 29, 2008 | Kenmore 62702 Microwave Oven

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