Question about Emerson Microwave Ovens

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How do I correct a microwave that runs automatically with a display when connected to power outlet but does not heat up anything. The kitchen timer,clock and all other buttons works except express coo

Model no MW9339SB S/n 203054795MM

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  • Master
  • 985 Answers

Sounds like the magnetron isn't getting power or is faulty. This is the thing that emits the microwaves that cause food to be heated. Basically it's like the 'engine' of the microwave. Your engine either has no power for some reason or it has died.

If you had the skills required to fix this then you probably wouldn't have needed to ask the question here. Just like a car, you can't fix a broken engine by pressing buttons; it needs the intervention of a mechanic. It's the same with your magnetron.

The Emerson is a cheap brand and this is a cheap microwave. Spending $80+ on parts and labour to fix a $60 microwave makes no sense. Sorry, but thems the facts. Unless you can get a cheap replacement magnetron for under $30 and fit it yourself then I'd seriously consider buying a new microwave of a decent make with a better reputation for reliability.

Posted on Nov 07, 2014

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  • Contributor
  • 13 Answers

Check and replace magnitron with one of the same number or equivalent.High tension transformer fuse may be blown or high voltage diode and or capacitor shorted. N.B. Please disconnect applance from mains and discharge large capacitor before carrying any DIY on any microwave,

Posted on Nov 07, 2014

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Posted on Jan 02, 2017

  • 17 Answers

SOURCE: Microwave turns on, but no heat or turntable movement

The problem is that the magnatron is not getting power. Chance is that if could be a bolwn fuse inside the unit. If the fuse don't fix it then that leaves the charging diode, capacitor or the magnatron, or high voltage xformer of which without technical epertize I would not recomend attempting to replace. good luck

Posted on May 14, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: sharps microwave

This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a problem on the control panel.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can probably find exploded views and order parts by entering your model number (R-520JKF) here at the Sears parts site.

The best place to order Sharp parts is Tritronics.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Aug 21, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave Oven Does Not Start Cooking

This is usually caused by either a bad door switch or a loose door switch mount, which are pretty simple problems to fix.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

If you don't find yours, or if you want to look at it without disassembling the oven, you can download it here.

If yours is not shown at the parts site or manual site linked above, Please reply back with your brand and model number so we can help you.

If you only need a switch, you can order a universal type here for $5 postpaid.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases in about a week or so.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 25, 2008

bestdarngood
  • 3037 Answers

SOURCE: 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

Posted on Apr 26, 2009

  • 1 Answer

SOURCE: My Galanz microwave WP800AP20-6 is beeping for no reason

I have similar problem

Posted on Jul 27, 2010

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1 Answer

On breaker 7 that runs the lights and receptacles in 2 bedrooms, the light in my crawlspace, the light in the attic, two ceiling lights in the kitchen (but no receptacles), and the outlet for the...


1) You must see if the circuit where the microwave is overload, you must use the amperimeter and see how many amperes are reading when all the load in the circuit 7 are running. if is normal about 10amp-12amps the circuit is o.k
2) test the c.breaker can be faulty, since there are NOT tripped.
3) However you must see if the lines for power in that circuit is loose?
4) Tight very well the Neutral +Ground
5) see the diagram attached, and correct if the outlet is wrong.
6) If you are NOT qualified to do this electrical job , call some electrician for to avoid danger to your home or yourself.

God bless you198ace60-27b8-4867-bf57-4b0086ba4f59.jpg5755a5d4-1228-483b-969d-82f0a795cbc3.gif
Of course you must test the microwave magnetron for faulty or short in the magnetron+diode+transformer+capacitor. ISOLATED the microwave first and then troubleshooting the circuit of your home.
God bless you

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Check to see if circuit breaker is tripped in the electrical panel, or if it is connected to a ground fault outlet, it may have tripped. Sometimes there is one ground fault outlet serving others in series in the kitchen.

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Hello

Try to cook something simple such as microwave popcorn. If the unit does not light up or turn on, check the outlet with another appliance to make sure the outlet is functioning correctly.


Check the fuses or circuit breakers in you house. If the outlet does not work after testing it with another appliance, try to plug the microwave in a different outlet.


Check the hinges and door hooks to make sure the door is closing properly. Look to see whether a small piece of food is clinging to the door, preventing it from closing all the way. Check the release mechanism and the rotating plate to make sure they can move freely as well.


Plug in the microwave and start it a the bag of microwave popcorn inside. If the lights go on but it is not producing heat, listen and try to hear whether the unit sounds the way it usually does. If it does not, there might be problems with the circuit board. This will need to be repaired by a certified Frigidaire professional.


Check the display that shows the time and power. If the display is flickering but it does not alter the operation of the microwave, it is not a problem. If, however, the lights flicker and your food is not heating, there may be a problem in the microwave cabinet.


Listen for buzzing sounds. If there is a buzzing sound and no heat is being produced, you may have to get a new magnetron, power diode, or high-voltage capacitor. These can be purchased from a Frigidaire retailer.


Look at the handle on the door. The most common complaint about all models of the Frigidaire microwave, according to Consumeraffairs.com, was cracked or broken door handles. Frigidaire will replace faulty handles while the oven is under warranty. In many cases, they will replace the handle even after the warranty expires for a "reasonable" amount of time.

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The problem is in the microwave oven, you have a short in the power supply or it could be a defective door switch, either way the unit needs to be checked out.

Feb 27, 2011 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

Machine will not turn on


from online Microwave Repair Manual: Totally dead oven (no lights, no clock, no display, no fan, no heat...)First, check power to the outlet using a lamp or radio you know works. The fuse or circuit breaker at your service panel may have blown/tripped due to an overload or fault in the microwave oven or some other appliance. You may just have too many appliances plugged into this circuit - microwave ovens are high current appliances and should be on a dedicated circuit if possible. If you attempt to run a heating appliance like a toaster or fryer at the same time, you *will* blow the fuse or trip the circuit breaker. A refrigerator should never be plugged into the same circuit for this reason as well - you really don't want it to be without power because of your popcorn!

If you find the fuse blown or circuit breaker tripped, unplug everything from the circuit to which the microwave is connected (keep in mind that other outlets may be fed from the same circuit). Replace the fuse or reset the circuit breaker. If the same thing happens again, you have a problem with the outlet or other wiring on the same branch circuit. If plugging in the microwave causes the fuse to blow or circuit breaker to trip immediately, there is a short circuit in the power cord or elsewhere.

The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.

Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.

Assuming these are not your problems, a fuse has probably blown although a dead controller is a possibility.


While you can do some repairs on your microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, go to the link at the top of this post.

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