Question about Whirlpool MH7140XF Microwave Oven

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Whirlpool model MH7140XFB-1 no longer heats up and is making very loud deep humming noise. It also leaves an odor similar to burning plastic. All moving parts and keypad seem to be operating correctly.

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

daverh
  • 117 Answers

SOURCE: Makes a loud humming noise while operating

Almost certainly, the component called the "magnetron" has died. This is the valve (tube in the US) which actually generates the microwaves. The loud humming is the transformer that supplies the magnetron being overloaded and/or the magnetron itself. If the rest of the appliance is OK and not too old, the magnetron can be replaced. If you aren't familiar with these appliances, you *must* get this done by someone who understands the dangers of messing with them - if you get it wrong, they can bite! In some countries, only qualified engineers can buy the spare parts. In the UK, the part costs around £40 - £80, depending on the model. If the appliance is more than around three years old, it may be a false economy to repair it as other parts may fail soon after the repair.

Posted on Sep 24, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Humming noise in cook mode.

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

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

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)


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

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

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

Posted on Jan 03, 2009

  • 2468 Answers

SOURCE: whirlpool model number MH7140XFB no longer heats

you either need a new h.v. capacitor or h.v. diode in the magnetron circuitry if you cant hear it cycle when it runs as in a low pitched hummmm when its drawing current to operate the magnetron tube, each part runs about $30 to $45 each,normally its the h.v. capacitor though

Posted on Jul 28, 2010

heatman101
  • 43501 Answers

SOURCE: microwave oven MH8150XJT0 is NOT

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

heatman101

Posted on Apr 02, 2011

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Microwave oven MH8150XJT0 is NOT HEATING -- MAKING LOUD, DEEP HUMMING SOUND -- SMELLS LIKE ELECTRICAL BURNING


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Basic Microwave Oven TroubleshootingTips

heatman101

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Whirlpool model number MH7140XFB no longer heats


you either need a new h.v. capacitor or h.v. diode in the magnetron circuitry if you cant hear it cycle when it runs as in a low pitched hummmm when its drawing current to operate the magnetron tube, each part runs about $30 to $45 each,normally its the h.v. capacitor though

Jul 28, 2010 | Whirlpool MH7140XF Microwave Oven

2 Answers

Our Sharp microwave oven turns on, makes a loud humming noise, starts to smell like something is burning, but doesn't heat. Well, actually, we don't think it heats, we're too scared to let it run because...


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Dec 10, 2009 | Sharp R-530ES Microwave Oven

1 Answer

Whirlpool builtin microwave humkming loudly


yes for sure magnetron or diode has gone bad.but usually it is the mag.magnetron when go bad they start making noise and stop heating.when chaging magnetron chg the diode with it.

Aug 18, 2009 | Whirlpool MH7140XF Microwave Oven

1 Answer

My Model MH7140XFB-1 over the overn Whirlpool


There is an internal fuse. The cause for it blowing will have to be determined.
eric

Aug 06, 2009 | Whirlpool Microwave Ovens

1 Answer

Humming noise in cook mode.


With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

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

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)


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

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

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

Jan 01, 2009 | Whirlpool GH7145XF Microwave Oven

1 Answer

GE Spacemaker XL1800(JVM1850CF001) - Loud Humming noise


You either have a bad magnetron tube (5 or 10 year parts warranty item through GE Factory Service 1-800-432-2737 or www.geappliances.com) or a shorted high voltage rectifier. I think the light being out is a secondary problem.

Dec 18, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Makes loud hum and faint smell when turned on


It sounds like your magnetron failing.

If a fuse were blown, it would be totally dead with no lights, no display, etc.

Keeping it out of the landfill a while longer by getting it fixed is always an option.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

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

Nov 20, 2008 | Goldstar MV-1501 Microwave Oven

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