Question about Microwave Ovens

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We were using only vent fan on Magic chef microwave oven model MCO153UWF, after switching off the fan, few minutes after found microwave was dead. Open the control panel main fuse 125V 20AMP fuse dead

After switching off the fan, few minutes after found microwave was dead. Open the control panel main fuse 125V 20AMP fuse dead. Can we replace the fuse with 250V 20AMP. Please advise

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  • Microwave Ovens Master
  • 6,771 Answers

Yes you can,

Posted on Apr 19, 2012

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9174 Answers

SOURCE: Replacing the fuse of a MCO160UW

A microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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

There may 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.

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

Posted on Jul 19, 2008

MicrowaveSvc
  • 9174 Answers

SOURCE: GE Microwave Spacemaker oven, Model JVM240

That would almost certainly be a problem on the control circuit board. If the bulbs happen to short / blow out or if they are removed or installed while the microwave is still plugged in, there is often an arc which causes damage to the board. We repair regularly these boards for such problems for $32.50 nationwide.

Posted on Dec 25, 2006

MicrowaveSvc
  • 9174 Answers

SOURCE: Microwave Oven completely dead

I sure hope the hood fan was on... It should always be on whenever you're boiling on the stove top, otherwise moisture can get into the microwave controls. The typical microwave will have just one power line fuse and two thermal fuses and/or thermostats, and the failure of any one of these can render the oven "dead". One thermostat / thermal cutout will be on or near the magnetron and one will be on top of the chassis / cavity. Does the inside light come on when you open the door? If so, then it's probably a problem in the control unit. If not, then it may be a bad thermostat or thermal cutout but it may still be the control unit. We have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You may find helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383 or http://www3.sears.com If you think it's a problem with the control panel, we repair those for $32.50 nationwide in most cases. Full info is available via our listing here on FixYa: http://tinyurl.com/yzjozk

Posted on Feb 22, 2007

MicrowaveSvc
  • 9174 Answers

SOURCE: Magic Chef Model#MCMY10SCC-No Heat-Smoke coming out

To obtain warranty service on your Magic Chef or E-Wave product within the initial one year warranty period please complete the form here.

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

Posted on Nov 27, 2008

MicrowaveSvc
  • 9174 Answers

SOURCE: Panasonic nn-p295 blows buss fuse when turned on for cooking

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer. But this is likely an inverter model, so it wouldn't have one and would be some other component in the inverter I'd say.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

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

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.microwavedisplay.com/safety.txt

http://www.microwavedisplay.com/disassembly.txt

http://www.microwavedisplay.com/doorsw.txt

http://www.gallawa.com/microtech/cap_test.html

http://www.gallawa.com/microtech/xformer.html

http://www.gallawa.com/microtech/mag_test.html

The best place to order Sharp parts is Tritronics. Or you can call them toll-free at 866-779-5835.

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

Posted on Dec 26, 2008

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1 Answer

Replaced 20amp fuse that was blown. new fuse did not blow, but oven is still dead.


see this causes and fix it. God bless you
If your microwave oven doesn't seem to work at all, check these: Fuses Door switch Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it. Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work
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Sep 22, 2012 | Cuisinart CMW-100 Microwave Oven

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We have magic chef Over the Range Microwave Oven Model: MCO153U. Microwave was dead and no power


The original problem, was probably caused by a bad door switch along with the fuse, now there is a good chance the control panel is damaged, you will need a professional to assess if the item is worth fixing.

Apr 21, 2012 | Magic Chef Microwave Ovens

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It just quit while cooking. Is there afuse in this microwave?


If the model number is correct, there is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted at the point where the power cord enters the back of the unit. You will need to UNPLUG the microwave oven and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. I found this illustration at pcappliancerepair.com based on the model number you listed this question under:

http://pcappliancerepair.com/model-display.php
The line fuse is listed as item 12.

You can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit.

Apr 27, 2010 | Maytag MMV1153A Microwave Oven

1 Answer

Yesterday, my sharp carousel r-1460 went dead. I took apart the front keypad and replaced the 20amp fuse behind it. the microwave light and fan work.But, when I start microwave to cook something, pop! fuse...


If the 20A fuse is blowing, it is often the high voltage transformer or magnetron. If this is the case, and the microwave is not under warranty, replace it. Residential microwaves are generally considered disposable. Parts and labor are just too expensive. A magntron or transformer can cost more that half the cost of a new microwave.

Feb 24, 2010 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

Whirlpool microwave gh7208xrq totally dead 20amp


In many Whirlpool models, there are several fuse and thermal cutouts (TCOs) / thermostats.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.


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

Jan 30, 2010 | Whirlpool GH7208XR Convection / Microwave...

3 Answers

Panasonic Microwave oven - cooking operation stops afer 2 seconds


Sounds like a short in the microwave circuit. One or more of the following four components has failed -

Transformer
Magnetron
Diode
Capacitor

Repair is not for the amateur, unless you know how to take things apart, and put them back together EXACTLY as the were found.

Parts are available on the Net, and you can get the P/N's off the old components to identify suppliers of the new ones.

Don't try and measure resistance of the diode. It's impedance is far too high to get a good reading. They're cheap anyway. Always replace the capacitor, they're cheap too. No way to test the magnetron, and the transformer is not easy to test either.

Jan 16, 2009 | Panasonic NN-S952 Microwave Oven

1 Answer

Fuse keeps blowing.


couple questions -
what else is on the circuit,
and what current does the oven need

there are whirlpool over-range models with
1200watts of microwave,
1500watts of convection power, a
60watt bulb and a
375watt fan

over 15amps -20amp circuit needed

if you inadvertantly replaced a higher current fuse with a 15amp fuse, it will blow every time.
the install guide http://www.whirlpool.com/assets/pdfs/product/ZINSTALL/8206589.pdf reccommends 20amp
not a solution, something to check,

Oct 14, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Wont power on


A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

The TCOs you need to be concerned usually with have all black or white wires only. Please reply with photos if you have questions.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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

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.

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

If you don't find yours, Please reply back with your brand and model number so we can help you.

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

Sep 06, 2008 | Microwave Ovens

1 Answer

R-1460


Check fuse. Remove 3 screws from the plastic grill located at along the top front of the unit. Remove the phillips head screw above the control panel. Slide up and pull out to partially remove control panel. You will see a white fuse. Replacement is CD3G 125v 20amp or BUSS ABC 20 or Little Fuse 314020 at 250v 20a. Radio shack caries the ABC.

May 12, 2008 | Sharp R-1460 Microwave Oven

2 Answers

Microwave Oven completely dead


Check if there's a fuse on the front panel.i'f had it on other makes.replace fuse and it should be ok.

Feb 22, 2007 | Kenmore 62702 Microwave Oven

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