Question about Maytag MMV4205 Microwave Oven

2 Answers

Function of thermostat-switch

Control panel works, but the magnetron does not come on. this is a new microwave that has never been used but warranty has expired. I tested for continuity on this part and it was dead. All the other thermostats checked o'k. Could this be my problem ? thanks, Al

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28 month old. MMV4205AAW MAYTAG MICROWAVE. WILL NOT HEAT AT ALL. all switches,capacitor,transformer,over loads are ok according to the help page i used in testing using my digital multimeter. every thing lights up . turn table ratates. all other functions seem to work fine. Gary L.

Posted on May 15, 2008

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We have *critical* safety, disassembly, and troubleshooting info at our
site, and our link is at our listing here on FixYa:
http://tinyurl.com/yzjozk

Once you\'ve looked those over, here are some links on part testing:
http://www.microtechfactoryservice.com/cap_test.html http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html

You can usually find helpful exploded view diagrams and order parts by
entering your full model number here: http://tinyurl.com/gv383
We\'re happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jan 13, 2008

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Posted on Jan 02, 2017

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1 Answer

Lightening strike messed up the functions. I did turn off the power, which restored some functions but not all.


you must proof again.
If NOT all function are restonrign, maybe you have a control board faulty. use the common sense, logically, and fix it. God bless you
Otherwise you must call some tech service.
can take some time. This is where you must be able to read a wiring diagram and do some "live" checks on parts. First easy check is to make sure power is coming off your control board at the MW relay. Make sure of the wires and test here, if you have 120 volts at this point, you have ruled out a lot of parts that could be the problem. You have now ruled out any switch problems, control board problems, or a thermostat or 2.If you do not have power from that MW relay on the control board, you must trace the wiring back to see if the proper voltage is going through your switches, any thermostats, and arriving at your control board. Your wiring diagram on your sheet will show you where and what to test. Below is a general switch test troubleshooting guide.

mwswitchtest.jpg mwswitchtest2.jpg If the proper voltage is coming into your control board and you are not getting voltage at the MW relay, then you need to replace the control board. If voltage is interupted by a thermostat or switch from your testing to the control board, then replace that part.Now, testing from the MW relay on to your transformer, high voltage capacitor, magnetron, and diode. Do not do any voltage reading from the secondary side of the transformer on, this can be a deadly microwave oven repair if you do not follow directions. This can result in electrocution and the "blowing-up" of your voltmeter, only do OHM testing with the power off and the capacitor discharged. Someplace in this circuit, usually before the transformer, you will have another thermostat to test. It is usually mounted on the magnetron. Do a quick OHM test to see if it is open or closed.
Now to test either the transformer, high voltage capicitor, magnetron, and diode, you must test each part separately. A good rule of thumb, if your capacitor is bad, change the diode also. Another note, if you are working on an OTR model and you have determined to be one of these "heating" circuit parts, you can not test these parts until you take the unit down. If you don't have the parts with you and you have to order them, order the magnetron, capacitor and diode and you will have a 90% chance of solving the problem. If it is an older microwave, order the thermostat also, most times you can return un-used, un-opened parts. Check with your parts supplier. This way you only have to take the unit down once.
To test these parts, scroll down this page and you will see a chart with component tests. Follow the instructions to find which part(s) are defective in your microwave oven repair.

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Aug 02, 2012 | GE Microwave Ovens

1 Answer

My ge countertop microwave suddenly became very hot and seems totally dead


Chances are the magnetron overheated and the thermal protector (thermal cutout or thermostat) on the magnetron tripped and interrupted the power.

This may be due to a blocked air vent, clogged filter, blocked outside vent, failed internal cooling fan, or failing magnetron.

There should be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille or elsewhere, and it is very helpful when troubleshooting, & testing.

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.

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

I'd recommend that your bookmark this link to your favorites.

Accessing some parts may require you to pull the oven from the wall and remove the cover.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.


You can download GE owner's manuals and installation instructions here.


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.

If it's under magnetron warranty, GE will send you the magnetron to do it yourself. Call them at 888-239-6832.

Warranty terms are detailed in your owner's manual.

If you prefer to arrange service by an authorized service center, GE Customer Service is here.

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

Dec 25, 2009 | GE Countertop Microwave Oven

1 Answer

We have a whirlpool GH5184XPS-4 microwave that we are getting an F7 error on. We removed control panel and parts of the board were scorched. we resoldered in loose parts still have smae problem


From the technical sheet usually located behind the control panel or grille:

F7 Power to magnetron interrupted

1. Check the door, hinge and cavity front alignment. Adjust as needed.

2. Check the operation of all interlock switches.

3. To check the over-temperature protection for the magnetron, unplug microwave oven or disconnect power.

4. After 40 seconds, check to see whether this solves the problem.

5. If this solves the problem, check the cooling fan for proper operation or blockage.

6. Unplug microwave oven or disconnect power.

7. Check resistance of the magnetron thermostat. It should be close to 0 ohms. If necessary, replace magnetron thermostat.

8. Check that the control cable to the 1100 watt inverter is correctly connected to plug P2 on the display PCB. If necessary, adjust or reconnect.

9. If interlock switches operate correctly, replace 1100W inverter.

10. If problem persists, replace electronic control.

11. Plug in microwave oven or reconnect power.

You can usually find helpful exploded view diagrams and order parts 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.

Dec 06, 2008 | Whirlpool GH5184XPQ Microwave Oven

1 Answer

Microwave F-7 Code


F7 is q Power to magnetron
interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check resistance of the magnetron thermostat.
6. Check the magnetron.
7. Check P2, P4 and P27 connections.
8. Check wiring to the 1100W inverters and control system. See
“Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace inverter, if defective.
11. Replace all parts and panels before operating.
12. Plug in microwave oven or reconnect power.
13. If problem persists, unplug microwave oven or disconnect power.
14. Replace electronic control.
15. Replace all parts and panels before operating.
16. Plug in microwave oven or reconnect power.
17. If problem persists, unplug microwave oven or disconnect power.
18. Check for reversed plug connection on controls or loose wiring.
19. Replace all parts and panels before operating.
20. Plug in microwave oven or reconnect power.

Aug 08, 2008 | Whirlpool GH6177XP Microwave Oven

1 Answer

Microwave


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 it's a bad magnetron and 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.

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.

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

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.

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

Jul 17, 2008 | GE Advantium 120 Convection/Microwave Oven

2 Answers

Won't heat


Hello,

The Microwave's "Magnetron" is what heats things up. This is true for all Microwave's. The magnetron is normally on the left and sends excited electrons across the interior. Those electrons bounce around inside until their energy is spent.These excited electron 'waves' are slightly larger than the hole openings in the front door glass panel black grid. Usually, when a magnetron goes you would see and hear some popping and witness some arcing inside the interior. However, you may not have been nearby when this happened. Since you heard popping behind the control panel, you probably have electronic failure in the control panel and that failure may have been precipitated by the magnetron or not. In any case, it is very dangerous to disassemble a Microwave and access the magnetron unless you are trained and have been qualified to do this.

With the cost of Microwaves having stabilized and also being quite low compared to 20 years ago, I would take it to a warranty service provider in your area that also sells them, such as Home Depot for example. That way, if it is too costly to repair compared to a replacement cost you can shop for a new one and may even get a discount should you ask them to give you one.

Sorry for the apparent bad news but if you feel this is the answer you're looking for please rate this solution as fixed or helpful. It means a lot to those of us who work for you in the free area instead of for a fee.


You can phone or write this address below for questions regarding your warranty or warranty repairs. Othewise, you can shop online for a replacement at homedepot.com or sears.com

May 24, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Model # jem31gy001


TO brenda_g

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

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

You can 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.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

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

TO Guest

It sounds like your magnetron is overheating and tripping the internal thermostat. The magnetron usually has a 5-year warranty.

GE Customer Service is at http://www.geappliances.com/service_and_support/contact/

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

Apr 20, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

No Heat


Most likely is the magnetron that failed. This is very common problem with microwaves.
Check the user manual under warranty, sometimes the magnetron has 5 years warranty.

Feb 16, 2008 | Whirlpool GH7145XF Microwave Oven

1 Answer

Over range microwave not working properly


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 conneciton on the control unit circuit board
- bad magnetron or other high voltage part

 

At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.

 

See our listing here on FixYa: http://tinyurl.com/yzjozk

Oct 15, 2007 | Whirlpool MH6150XL Microwave Oven

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