Question about Whirlpool MMV4205BAQ Microwave Oven
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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
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
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
The operating manual is at;
Installation instructions are at;
Posted on May 21, 2009
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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