Question about LG LTM9000 Microwave Oven

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Microwave oven not heating

My microwave oven in working but does not generate heat to cook food, can you give reason for the same.

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  • Anonymous Nov 08, 2008

    My Kenwood GJ/SS25 is doing the same. Turntable spins, light on, timer works but doesn't heat. I therefore surmise that it's not the door switch. Trouble is it's only about a year old, my last cheap microwave last 7 years before I got rid of it and it was still working just it was starting to rust. Pretty unimpressed that it's packed up in such a short space of time.

  • CVINTON Dec 13, 2008

    My LG LTM9000 micro failed during popcorn. Everything else works. Magnetron?
    cv


  • Anonymous Apr 09, 2009

    Wen using convection, I'm getting error code 02

  • William Miller
    William Miller May 11, 2010

    When you hit Start to cook, do the inside light and turntable come on?

    Any unusual noises?

    Is it louder or quieter than usual?

    Do you have the model number?

    These answers will help me judge whether it's in the high voltage
    section (magnetron, transformer, or diode) or the control section
    (door switch or control board relay or connection).



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Test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

The diodeand capacitors can be tested. The capacitor must bealloweddischargebefore testing, or you risk to get electrocuted, evenifpower is off.Capacitors can get discharged by shorting theirtwocontacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

You can also order from MicrowaveSvc , they also provide parts.

Posted on Apr 27, 2009

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1 Answer

Temperature at 10 power level


It does not work that way. The microwave OVEN generates (electromagnetic) microwaves that are absorbed by the molecules of the food in the oven, the container and the air.
The absorption rate depends on the molecular composition. After enough microwave energy is absorbed the overall temperature increases and the food is warmed, heated or cooked. If your mixture is inhomogeneous some parts absorb more energy while other absorb less and you can have hot spots.

The power level by itself won't give you an indication of the temperature because you need to know the time that the power has been applied. In simple terms Energy =time*power. The temperature reached is somewhat proportional to the energy, that makes it dependent on the time and the power.

Dec 22, 2013 | Haier MWM0925T 0.9 cu. ft. Microwave With...

Tip

Microwaves and how they work. ­T­he microwave oven is one of the...


Microwaves and how they work.

Caption
--> ­T­he microwave oven is one of the great inventions of the 20th century -- millions of homes in America have one. Just think about how many times you use a microwave every day:


Caption
-->
­

­You're running late for work, so there's no time to fix breakfast at home. On your way to the office, you stop to gas up your car. Inside the quickie-mart, you grab a frozen breakfast burrito and pop it in the microwave on the counter. Later that day, you have to work through lunch. By 3:00 p.m., you're starving, so you grab a snack-pa­ck of microwaveable popcorn from the vending machine and pop that in the break-room microwave. That night, after a really long day at work, you're simply too tired to grill out, so you dish up last night's lasagna and heat it up in the microwave...
As you can see, microwave ovens are popular because they cook food in an amazingly short amount of time. They are also extremely efficient in their use of electricity because a microwave oven heats only the food -- and nothing else. In this article, we'll discuss the mystery behind the magic of "meals in a minute" with microwave cooking.

­A m­icrowave oven uses microwaves to heat food. Microwaves are radio waves. In the case of microwave ovens, the commonly used radio wave frequency is roughly 2,500 megahertz (2.5 gigahertz). Radio waves in this frequency range have an interesting property: they are absorbed by water, fats and sugars. When they are absorbed they are converted directly into atomic motion -- heat. Microwaves in this frequency range have another interesting property: they are not absorbed by most plastics, glass or ceramics. Metal reflects microwaves, which is why metal pans do not work well in a microwave oven.

Microwave cooking ­You often hear that microwave ovens cook food "From the inside out." What does that mean? Here's an explanation to help make sense of microwave cooking.
Let's say you want to bake a cake in a conventional oven. Normally you would bake a cake at 350 degrees F or so, but let's say you accidentally set the oven at 600 degrees instead of 350. What is going to happen is that the outside of the cake will burn before the inside even gets warm. In a conventional oven, the heat has to migrate (by conduction) from the outside of the food toward the middle. You also have dry, hot air on the outside of the food evaporating moisture. So the outside can be crispy and brown (for example, bread forms a crust) while the inside is moist.

In microwave cooking, the radio waves penetrate the food and excite water and fat molecules pretty much evenly throughout the food. No heat has to migrate toward the interior by conduction. There is heat everywhere all at once because the molecules are all excited together. There are limits, of course. Radio waves penetrate unevenly in thick pieces of food (they don't make it all the way to the middle), and there are also "hot spots" caused by wave interference, but you get the idea. The whole heating process is different because you are "exciting atoms" rather than "conducting heat."
In a microwave oven, the air in the oven is at room temperature, so there is no way to form a crust. That is why microwavable pastries sometimes come with a little sleeve made out of foil and cardboard. You put the food in the sleeve and then microwave it. The sleeve reacts to microwave energy by becoming very hot. This exterior heat lets the crust become crispy as it would in a conventional oven.




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on May 07, 2010 | Microwave Ovens

1 Answer

Not heating


Hello


Power Supply

Check whether there is a proper power supply. Look to see whether the cord is connected to a grounded 3-prong outlet and the cord is fully plugged in. If the electrical system is built-in and no power cord is visible, replace or reset the household fuse or circuit breaker.

Microwave Functions

Some basic microwave operational steps may affect whether the microwave is heating. Open and close the microwave door, as the unit will not function with the door open, and push "Stop/Clear" to cancel any previous settings, such as the timer, which do not heat the microwave oven.

Setting the Microwave

Once the power to the microwave has been reset, or verified as working, and the microwave is ready to run, select a new cook cycle and press "Start" to see if the microwave begins to run and cook food as expected. Allow the food to cook for the alloted time and then open the microwave door and check to see if the food has cooked or heated. Choose a longer cooking time and restart the microwave if food is heating but is cooking slowly.

Repair

If all efforts to troubleshoot the function and power to the microwave still do not get the appliance heating food as expected, there may be a repair issue that needs to be addressed. Contact professional technician for advice.

Oct 05, 2011 | Sanyo Microwave Ovens

1 Answer

MY LG microwave oven model no MH6344W does not heat the food .The oven is fine after 1 minute microwaving if i remove the food it is as cold as it was. What would be the reason please explain. I tried...


Hi,

If the food is not being heated it means the magnetron is not working. The magnetron is the device which generates microwaves which heat the food. It could be the magnetron itself which is faulty or it could be one or 2 other components causing the magnetron not to work. You will have to take your microwave oven to a service center to determine the exact cause & get a repair quotation.

Let me know if you need further assistance.
Best wishes,
Graeme

Mar 17, 2011 | Microwave Ovens

1 Answer

Lg 700 w microwave everything is working as normal but the food is not heating up


There three parts that will cause this, the first is the magnetron "heats food" the most expensive part, followed by the high voltage capacitor and diode, they work in conjunction to generate the high voltage to cook the food.

Feb 03, 2011 | LG Microwave Ovens

1 Answer

My ifb microwave oven is getting hot outside while


Normally when u cook food in microwave the fod is cooked by microwaves, which means the heat is generated with in food. The temperature inside is never too hot and all the heat produced is absorbed with in the food.

On the other hand when the grill is switched on, a separate heatting element gets switched on. You can see this red hot element on the top side of inside of microwave. the heat from this element gets transferred to food through air circulation. But partof heat also gets transferred to the walls of microwave oven. This is the reason the wall feel hot during use of grill.

As i see ther is no problem with the microwave itself. Jut kep delicate thngs a bit away from the microwave.

Oct 17, 2009 | LG Microwave Ovens

1 Answer

Microwave doesn't heat food anymore


Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Benjamin

Apr 21, 2009 | Frigidaire PLMV168 Microwave Oven

1 Answer

My GE spacemaker microwave doesn't heat up foods. There is a slight bit of heat generated but not much. All timers, lights, etc. work normal. It is a GE model jvm1440. It is about 3 years old. The problem...


IT COULD BE A NUMBER OF THINGS RANGING FROM DIODES TO CAPACITORS TO YOUR MAGNATRON OR THERMOSTAST OR TRANSFORMERS. IT'S DIFFICULT TO DIAGNOSE WITHOUT SEEING THIS MICROWAVE. YOU MAY BE BETTER OFF GETTING YOURSELF A DIFFERENT ONE.

Apr 11, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Kenmore microwave stopped heating


simply stated.. if it fails to cook.. you may have either a bad magnetron tube ( that's the part that generates the microwave energy that cooks the food) or the filament transformer feeding that magnetron is bad. In either case.. you're probably better off replacing the entire appliance than repairing it.. Hope that helps...

Aug 30, 2008 | Kenmore Microwave Ovens

2 Answers

Microwave does not heat food placed in the center of the turntable. Leaves a cold spot in the middle of the food.


This is normal. That's why I always recommend to my customers that the food be placed slightly off-center on the turntable. An analogy I refer to is stirring paint: If you stir paint with a stick by simply rotating the stick in the center of the can, it's far less effective than pulling the stick around an imaginary circle halfway bewteen the center and the edge.

Jun 09, 2006 | Whirlpool MH6150XMS Microwave Oven

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