Question about Whirlpool MMV4205BAQ Microwave Oven

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Yesterday my Maytag microwave stopped working correctly. It's the model MMV4205BAQ and when you go to heat something it will go for about 2 seconds and then the whole display will light up with starnge symbols and shut down. After a few seconds it will say to set the clock. It does the same thing every time and I've even tried unplugging it in hopes that it would reset itself with no luck. Any ideas what the problem is? We've had it for at least a couple years, but it was only installed and being used for the last year or so.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: Microwave does not heat

Just had the same experience with the identical model. Removed the cover (a challenge because of the security screws), revealing valuable troubleshooting directions intended for an experienced technician. However, I think the info is well within the reach of a typical DIY person, does not require any dangerous power-on conditions. However, make sure that you discharge the HV capacitor before trouble shooting. In my case, it appears that the HV diode is open, have ordered a replacement on the internet for $3.18, easy to replace. Hope it works. Good luck.

Posted on Jul 14, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: MIcrowave oven stopped heating - Whirlpool MH6150XMS

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.

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

Posted on Mar 20, 2008

  • 1 Answer

SOURCE: humming sound when off

I also have the same microwave model and with the same problem. It is not quite 2 years old. I have a service call scheduled but did e-mail customer service at Whirlpool to inform them of this. Sounds like it could be defective model and a fire hazard. You should also inform them of yours.

Posted on May 16, 2008

  • 718 Answers

SOURCE: need installation instructions Maytag Over the Range Microwave MM

The operating manual is at;
http://www.amroyal.com/pdf/mmv4205_manual.pdf



Installation instructions are at;

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Installation%20Instructions%20-%208101P710-60.pdf

Posted on May 21, 2009

ginko
  • 19396 Answers

SOURCE: Whirlpool MH1140XM: has power, but no heat, turntable not spin.

Test the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

Posted on May 21, 2009

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It depends on your full model number:
You can find helpful exploded view diagrams and order parts and accessories by entering your full model number here.

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

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Everything else seems to work fine but when I take


Magnatron has failed, possible internal fuse to the Magnatron,or the Magnatron itself has gone bad.
Both are replaceable, but the microwave will have to be taken down to gain access to these parts to be serviced.
Now, depending on the age of the unit, it may not be wise to invest the cost for this repair, unless, is it still under the manufactures 1 year warranty or did you purchase an extended service contract on this unit?
Good Luck !

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In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man.
Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.

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Need installation instructions Maytag Over the Range Microwave MM


The operating manual is at;
http://www.amroyal.com/pdf/mmv4205_manual.pdf



Installation instructions are at;

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Installation%20Instructions%20-%208101P710-60.pdf

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