Question about Whirlpool MH7155XM Microwave Oven

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Sometimes it heat food and sometimes not. Will always work at first but after it's hot, it will not work. If you cook a pizza pop, it will be fine. But it will not heat for a second one. Will always work after it sits for awhile. You can make a bag of popcorn, but can not melt butter after.

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  • donnest Nov 17, 2009

    As far as I can tell the fans always work. When it heats food there is a definate buzzing sound (magnatron).

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  • Master
  • 4,088 Answers

Does the internal blower run during cooking? This blower is located near the magnetron tube and is essential to the operation of this tube.

Posted on Nov 17, 2009

  • drallim Nov 17, 2009

    After looking around for similar complaints, the consensus seems to be: bad magnetron. But this also seems to be a blanket diagnosis. If the magnetron is not properly seated on the wave-guide assembly, it can be intermittent. If the magnetron has an air-leaking electrode glass seal, it will cause internal arcing within the magnetron and definitely must be replaced ($150 or so). Because this thing runs about 5000 volts to operate the magnetron, you must be experienced with high voltage or send it out for service.You should evaluate the likely cost vs a new oven. Sorry that I don't have good news!

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Back panel of microwave gets hot while in use


would you not also get hot when in use . if you were heating food to be totally cooked .that is why they have a fan in them

Jun 19, 2016 | Magic Chef Microwave Ovens

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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.




­

on May 07, 2010 | Microwave Ovens

1 Answer

Panasonic microwave


I would check the cooking instructions on the side of the pizzas packaging. If microwave cooking is not listed I would not recommend cooking it in a microwave as this could make the food unsafe to eat.

But if you're short of an oven I have found a guide on barbecuing a pizza:
How to Cook Pizza on Barbecue

Mar 20, 2014 | Avanti Microwave Ovens

1 Answer

Food in microwave is burning on edge and cold in the center


you may find the old unit was lower watts so took longer & cooked/heated better all the way through. a way to fix this is lower temp settings or pause and stir the food to help heat it up more even.

Dec 29, 2013 | KitchenAid KHMS2040BSS Stainless Steel...

1 Answer

MCD1611W New, popping popcorn in glass MW corn popper. 3-4 minutes to pop. After popped I open the door and after a few seconds the MW shuts down completely, no lights, no response to pad pushing.


Popcorn is a low-moisture food which can cause a microwave to overheat, as can a failure of the cooling fan or blocked vents.

You should always turn a paper plate upside-down on the turntable (slightly off-center for better heating) and place the popcorn container on top of that.

The paper plate elevates the popcorn for better exposure to the energy and protects the turntable from excessive heat.

Placing food off-center instead of in the center increases exposure to the energy and prevents the same spot on the turntable from being overheated repeatedly, which leads to material fatigue and cracking.

It's also a good idea to put about 1/2 cup of water in a 1-cup microwave-safe container in the corner of the oven when cooking low-moisture foods like popcorn, bacon, and potatoes.

The microwave's magnetron has a thermal protector (thermostat, TCO, or thermal fuse) attached to it.

If the magnetron gets too hot, it can be damaged or destroyed, so the thermal protector opens and disconnects the power to the whole oven.

If it is a resettable device, the power will be restored when the device cools. If it is not resettable, the device must be replaced.

FixYa does not directly notify us experts of responses, so if you have other questions, please contact me directly.

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May 28, 2017 | Magic Chef MCD1611W

1 Answer

Let me know the functions of microwave?





Sorry to read about your problem, I hope this helps you out.


Display: This is used to show the time, cook time and options you chose during you use.
Cook: Use this feature to cook fresh vegetable, frozen vegetables, rice and cassroles.
Enter/Start: This is used to start and enter any option you choice while operating the unit.
Stop/Clear: Use this function to clear or stop the unit during cooking or choosing a feature.
Reheat: This is use to reheat dinner plates and left overs. Be sure that you do not use any plastic foam or metal plates/utensils this can cause damage to the unit and may cause injury.
Auto Defrost: This is used to defrost food by weight and type. EX: If you have 1 pound of chicken, meat or fish press in the food code by using 1,2,3 and then the weight in pounds (1 pound would be 1.0 enter.)
Quick Frost: This is use with the Rapid defrosting method for 1.0 pound frozen food. If you have a pound of meat, chicken or fish press Quick Frost and it will defrost for that weight only.
Cook Time: This is to set the cook time for the food you are trying to heat or cook. Enter the time you wish to cook and press enter/start (EX: 7mins and 30 secs = 730/start.)
Clock: This is used to set the time of day. Press Clock the the time of day it is and clock again (EX: 11:00 would be 1100 then clock.)
Number: This is the key pad used to enter the cook time, clock or power level.
More: This feature is to add time to the cooking time only in ten second intervals. If you want to add time without restarting press this button to add ten seconds each time it is pressed.
Less: This is used to decrease the cooking time by ten second intervals. If you want to decrease time without restarting the time press this to decrease cooking time in ten second intervals.


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Power Level: This is use to choose the power level in which to cook or heat food or beverages. To change the default setting of 100%, press the power level button and press the level you desire, if you desire only 50% then press power level the 5 and enter/start. Hint: Change the Power level before entering the time your setting to cook
EZ-ON: This is to quickly start the power level to 100%.
Vent High/Low/Off: This is to turn the vent located on the outside of the unit during use. You have the option of turning it off, on, high or low.
Light High/Low/Off: This controls the light on the bottom of the unit if you have a mounted range above your stove or under your top counter cabinets.
Hot Water: This is used to heat water for beverages such as coffee and hot chocolate. Use Extreme caution when removing baverages from your unit, they will be hot and could cause injury.
Popcorn: This is used to pop popping corn, when placing the popcorn in the microwave press the this feature and enter/start and it will automatically start the correct time for cooking. This feature is designed for the individual packaged popcorn use. Do not place any foil or loose popcorn in the unit this could cause damage or injury.
Kids Meals: This is used to REHEAT meals for children it works at a lower power level. This can be used to reheat hot dogs, oatmeal, baby food and soup. Do Not place any metal objects or objects than can melt this can cause damage or injury.
Warm Hold: This is to keep foods or drinks warm for any length of time up to 99 minutes and 99 seconds. Although it is not a recommended to run a unit at the maxium time limit.
Melt: This is used to melt butter, margarine, chocolate, cheese and marshmallows. Do not leave these items unattended during the duration of melting time to prevent any unwanted over heating.
Soften: This is used to soften ice cream, butter, cream cheese, and frozen drinks. Do not place anything in a container that is made of foam or metal this can cause damge or injury.
*Child Lock: If your model has this feature it is used to lock the unit to keep a child from pressing buttons or causing injury.
Open: This is the handle or button on the front of the unit to open the unit after the unit is done cooking or in use. Do not open the door during the use, always press the Stop/Clear button first. Also do not remove hot items without oven mits or waiting time food is at a safe handling temperature.

Jan 03, 2011 | LG LMVM2277ST Microwave Oven

1 Answer

Toaster Master 1979 has less power


Because the microwave energy is beamed into the interior of the microwave and then dispersed by a metallic "stirrer," the pattern of the energy can be fairly consistent, rather than completely random. But this pattern sometimes causes certain portions of the food to overcook (creating tough spots) and others to undercook. A microwave oven with a carousel is far better at cooking the food consistently--the pattern becomes quite random while the carousel is turning.

Nov 13, 2008 | Microwave Ovens

1 Answer

Microwave heating problems


Many over-the-range microwave ovens suffer from intermittent problems caused by excessive moisture from the range/stove entering the microwave cabinet and collecting on the circuitry. Often the problem is with one or two simple connections that may need tightening or soldering. But, to repair these components, the microwave cabinet needs to be opened. So we recommend that you seek the assistance of a qualified appliance repair technician.

Oct 03, 2008 | Whirlpool 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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