Question about Maytag MMV4205 Microwave Oven

1 Answer

The microwave wont heat. The high voltage diode was shorted and I replaced it with a new one. Still no heat and the buzzing sound. Could the diode have burnt out something else when it shorted?

Posted by on

  • Anonymous Mar 27, 2014

    Made a buzzing noise and now wont heat

  • Anonymous Mar 27, 2014

    made buzzing noise wont heat

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,037 Answers

A capacitor generally causes the buzzing sound. Look for the buzzing part or a buldging top on a capacitor

Benjamin

Posted on Aug 20, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

LG microwave oven Ms-1927c is not heating up. only buzzing sound can be heard.


That would likely be a shorted high voltage diode or failed magnetron.

Replacing the high voltage diode would be economical, but on most counter top ovens, replacing the magnetron would likely not be.
But the service manual is here: http://elektrotanya.com/lg_ms1927c.pdf/download.html
Here are a a couple of good help links:
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
You can order LG parts from Encompass here but since the service manual does not have part numbers, it would probably be best to call Encompass toll-free at 866-779-5835.

Aug 24, 2013 | LG LMV1630ST Microwave Oven

1 Answer

Sanyo EM-SL40S microwave everything seems to be working fine but food doesn't get hot?


see this causes and fix it. GOD BLESS YOU
Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.


High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.


Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.


Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.
10_2_2012_12_38_27_pm.jpg10_2_2012_12_38_56_pm.gif

Oct 01, 2012 | Microwave Ovens

1 Answer

Microwave heats but makes a lowd roaring noise


That would likely be a shorted high voltage rectifier diode or a bad magnetron.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

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.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

Dec 20, 2011 | Microwave Ovens

1 Answer

Microwave makes a buzzing sound and will not heat.mo.#4450786a.


The magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Dec 09, 2010 | KitchenAid KBMC140HSS Convection/Microwave...

2 Answers

Sharpe model R-1480 not heating (it sounds a little louder)


A loud sort of "groaning" noise and no heat is the sign of a bad magnetron tube. The magnetron is the microwave source, and when they go bad it's usually time to replace the oven. Most microwave repairs, especially a magnetron replacement, should be left to professionals. There are lethal voltages under the cover, and the chance of microwave leakage if the repair isn't done properly. With the price of a replacement tube and labor for the repair, it's often doesn't cost much more (and sometimes even less!) to buy a new oven.

Sorry I can't give you a more positive answer, but thanks for using Fixya!

Oct 31, 2010 | Sharp R-1480 Microwave Oven

1 Answer

Hello, i own a 7year old advantium oven everything works except the microwave, the key pad and timer shows its on but wont heat. any suggestions thanks


Is there any unusual noise or is it louder or quieter than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

If it sounds the same as usual or a little louder, I would suspect the magnetron or high voltage diode has failed.

If it is much quieter than usual I would suspect a bad upper door switch.

The service manual is here.

Also see this file on door switches.

Aug 22, 2010 | GE Advantium 120 Convection/Microwave Oven

1 Answer

NO HEAT IN "OTC" GE MICROWAVE


To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms ("no heat"), as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

- Is there any unusual noise or is it louder or quieter than normal?

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

(A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.)

Nov 27, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave will no longer heat. Model #MA-1000W


So we can help you, please post a NEW question, and please include your model number MA-1000Was well as the answers to these questions:

When you try to microwave are the inside light, internal cooling fan and turntable all working?

Is there any unusual noise or is it louder or quieter than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

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

Oct 11, 2009 | Goldstar MA-1011 Microwave Oven

1 Answer

How do I fix a Jenn-Air JMC7000 that does not heat up items?


The noise is coming from the high-voltage transformer being overloaded by something shorting it out. Either the magnatron or the high-voltage capacitor and diode. Replace the capacitor and diode then if still not working, replace the magnatron. Its only affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!

Jan 06, 2008 | Jenn-Air JMC7000 Microwave Oven

1 Answer

Panasonic microwave buzzing noise


Yes, this is usually a shorted high voltage rectifier diode.

It is usually located behind the high voltage transformer and it attaches to the magnetron and to the chassis.

For ciritical safety links how to test the diode, see: http://www.gallawa.com/microtech/diode.html
Panasonic replacement parts can be found here: http://www.pasc.panasonic.com/epartr

Dec 06, 2007 | Microwave Ovens

Not finding what you are looking for?
Maytag MMV4205 Microwave Oven Logo

Related Topics:

142 people viewed this question

Ask a Question

Usually answered in minutes!

Top Maytag Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

9047 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Devabhakthuni...
Devabhakthuni...

Level 2 Expert

225 Answers

Are you a Maytag Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...