Question about Magic Chef CMV1000B Microwave Oven

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MCO160UW When cooking for example popcorn or melting butter, unit shuts down like a thermal breaker trips after 5 min or so it turns back on needing to reset clock. Why

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Re: MCO160UW

I can tell that the fan is not working when the unit is on as well as the glass turntable is not spinning. If this is a problem with the magnetron (sp?) how do I fix it.

Posted on Nov 21, 2007

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Re: MCO160UW

It sounds like the magnetron is overheating and the magnetron-mounted thermostat is tripping.

This can happen if the internal cooling fan is not running - do you feel air strongly coming out the back or other vent?

If it has grease or other filters, be sure they are clean and not blocked.

Otherwise, the magnetron may be failing. Please post back once you've looked this over if you need more help.

Posted on Nov 05, 2007

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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

GE Spacemaker Microwave JVM1441 BH04 tripping circuit breaker

your power transformer for the magnetron could have a shorted primary power winding,the door safety interlock switch could be mis-adjusted,this normally blows the internal unit fuse,a shorted high voltage capacitor,or diode,a bare wire inside the unit,more than the microwave on that circuit or a weak circuit breaker in the house power panel

Jun 19, 2010 | GE JVM1441 Microwave Oven

1 Answer

Micro looses all power during cooking, power returns after a few

This is a defect. RERURN it while it is still under warranty. Tell the counter person you need to speak to his/her supervisor if they give you that song and dance again. Threaten to file a complaint with the better business bureau and with your state's attorney general. Be firm but polite and insist that they honor the warranty.

May 18, 2009 | Magic Chef CMV1000B Microwave Oven

2 Answers

MCO160UW goes dead after 3 minutes

I returned the item to Home Depot and they took it back no questions asked.

Nov 30, 2008 | Magic Chef CMV1000B Microwave Oven

3 Answers

Oven turns off


You are running the risk of damaging the Magnatron by doing this.

Check the packets you are using, you will have to reduce your power output.

This is because microwaves act by being absorbed by water. There is very little in popcorn and in fat. Once this has been evaporated, the microwave energy builds up (as it is still being produced - but not absorbed), and ends up cooking the magnatron itself.

I have seen countless posts on here after cooking popcorn!

More fun on the hob anyway - and cheaper to buy in bulk!

Jun 21, 2008 | Magic Chef MCD1311ST Microwave Oven

1 Answer

Does a microwave lose cooking power over time? having a problem cooking popcorn. whirlpool built in unit 18 yrs old. takes 4-5 min on high and cant cook most of it. more time just burs popcorn. i believe...

Yes. As the magnetron (The microwave generator) ages with use it becomes less efficient. As such it produces less powerful microwaves and loses penetrating

Apr 04, 2008 | Microwave Ovens

1 Answer

Magic chef over the oven microwave shuts off.

Is not normal for a microwave to shutdown after 4 minutes of operation.
From the info you are providing, It looks like the magnetron might be overheating causing the thermal fuse to shut it down until it cools down. There may also be a loose connection in one of the switches or a cold solder joint in the low voltage power supply.
I would suggest to check and make sure that the fans are functional, If always did; it could be that there isn't much air circulation where the appliance was installed.

Mar 03, 2008 | Microwave Ovens

9 Answers

Magic Chef MCO153UW

The cooling fan is a must!

Otherwise, the magnetron will be ruined, and that drives up the repair cost.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa:

You can order parts here:

To contact Magic Chef about getting an *authorized* servicer, see:

We're happy to help and we appreciate your thoughtful rating of our answer.

Jan 06, 2008 | Magic Chef CMV1000B Microwave Oven

2 Answers

Microwave stopped working completely

Fan turned on after cooking because a thermostat got to hot and tripped turning on the fan to try to cool the unit.  The unit went completely dead when thermal fuse tripped which is located above the cavity on the left side.

Oct 30, 2007 | Magic Chef CMV1000B Microwave Oven

6 Answers

Magic chef microwave shuts down

We had the same problem with our brand new Magic Chef. Before going through the trouble of taking it back I called Home Depot. After talking to a Home Depot Rep I am told that the overheat sensor is under the glass plate directly beneath the popcorn bag. Popcorn gets very hot and the heat of the popcorn causes the sensor to shut the machine down. I would imagine this would be the same for a baked potato.
Very poor design.
I was told to put a microwave safe plate down and put the popcorn bag on it. This should help to reduce the heat and not trip the sensor.
A safety sensor is great, but not if it keeps tripping the machine and shutting down!

Sep 02, 2007 | Microwave Ovens

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