Question about Sunbeam SMW777 Microwave Oven

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No heat I can hear microwave running but it just doesn't heat food.

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Sounds like your magnetron is not working. I would take off cover (power disconnected) and look for a fuse somewhere where the power cord comes in.

Posted on Apr 30, 2010

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Sanyo EM-SL40S microwave everything seems to be working fine but food doesn't get hot?


see this causes and fix it. GOD BLESS YOU
Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.


High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.


Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.


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.
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.
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Oct 01, 2012 | Microwave Ovens

2 Answers

Electrolux microwave buzzes and food doesn't heat up


If the unit operates correctly except heating the food, then the unit needs a new magnetron.

Aug 29, 2012 | Electrolux EI30BM55H Microwave Oven

1 Answer

Microwave oven mmv4205bab turns and runs but doesn't heat the food


There are a few possibilities, the magnetron is defective, or the high voltage capacitor or diode/or inverter board if microwave is under 7 years.

Apr 01, 2012 | Maytag Microwave Ovens

1 Answer

My microwave doesn't work, but display works


I would strongly consider replacing the microwave oven, prices have dropped considerably. The problem you are describing is in the keypad controller board.

Apr 01, 2012 | Samsung 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

Microwave lights up doesn't turn on


The part of the oven called the "magnetron" (this part is what creates/generates the microwave energy that heats the food or liquid) is burned out, the cost to repair is more this part is more than the cost to replace with the cost of Microwaves so depressed by the stagnant economy.

Jan 31, 2012 | GE Spacemaker 1.7 Cu. Ft. Over-the-Range...

1 Answer

My microwave comes on lights work but doesn't heat food


The most likely cause is a defective magnetron, "heats food" cost to repair will be close to a new microwave oven.

Jun 02, 2011 | GE JE1540 Microwave Oven

1 Answer

My samsung microwave oven is not heating up food. It works normally, lights on, food turning on plate, but not heating the food.


if your microwave does everything you have described , and you can hear the cooling fan running as well after you press the start button , you probably have a faulty wave guide. The wave guide is also called a Magnetron Tube. It is the main part of the microwave which produces the microwave energy . If this part is not functioning it is best to replace the entire unit, rather than have it repaired .

Oct 03, 2010 | Samsung Microwave Ovens

1 Answer

Microwave runs, turntable turns, fan runs, but does not heat,


No heat means the magnetron circuit has failed. It is the part that generates the microwaves to heat the food. Usually not worth fixing since the magnetron costs nearly as much as a new oven. To diagnose, if the oven is on, you will hear a loud buzzing sound if the magnetron is shorted.

Jun 30, 2010 | Sunbeam SMW777 Microwave Oven

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