20 Most Recent Maytag MMV4205 Microwave Oven - Page 3 Questions & Answers

consider this closed.

That will usually destroy the magnetron, if you are very lucky the thermal fuse that monitors the temperature has opened.

a common problem with this model is the magnetron goes bad...it is located behind the control panel and if changed requires disassemble of the cabinet...the cost of the magnetron is around 100.00 give or take a few dollars. depending on age may be a wise investment to purchase a new one...it could also be the capacitor or diode but if all the timer and lights are working just no heat it is common for the magnetron on this model...hope this helps good luck

Check your door safety interlock switches ...

When it's run empty, that will cause the magnetron to overheat.If it gets hot enough, the magnetron's thermostat will open.Normally it should cool down and reset, turning the oven back on.If not, the thermostat may have failed hard, and would have to be replaced.The fuse may be bad (also or instead).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. You can 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.

It may be a shorting high voltage capacitor, but may also be a bad magnetron or high voltage transformer.Here are some links youor someone you know can use for test help, but read their safetywarnings first: http://www.microtechfactoryservice.com/diode.html(if it\'s not shorted or burned, it\'sprobably okay)http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html
You can findhelpful exploded view diagrams and order parts by entering your fullmodel number from the tag on the oven here.We\'re happyto help you with free advice and we\'d appreciate your thoughtful ratingof our answer.

Hello,

Investigate these three areas if your microwave won't heat food and you hear a loud buzzing or humming noise.

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.

Testing a diode

NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor.

Whether it is shorted or open, a defective diode will most likely show some sign of defect. Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. Also, it may have split in two, or it may exhibit a burned crack, or possibly even a blistered spot.

A shorted diode is indicated by a loud humming noise from the high voltage transformer, and no heat produced when a cook cycle is initiated. Whereas little or no heat produced in your microwave, with an absence of a humming noise is indicative of an open diode. In either case, the diode has to be replaced.

With your microwave unplugged, and your capacitor discharged, use extreme caution to remove the lead that leads to the capacitor. You can leave the ground connection attached. The side of the diode that goes to the ground is usually marked with a dot, stripe, or arrow. Set your ohmmeter to R x 10,000 or higher. Touch the positive meter probe to the anode and the negative meter probe to the cathode to measure the resistance across the diode terminals. Remember that the cathode is on the side that goes to the ground, which is often marked by a dot, stripe, or an arrow.

A normal diode, that is a non-defective diode, will read anywhere from 50,000 to 200,000 ohms. Differences in microwave make and model account for this large range in resistance readings.

Reverse the meter probes and measure resistance while touching the positive probe to the cathode and the negative probe to the anode. Reversing the probes like this should result in a reading of infinity. Unless a bleeder resistor is present. The presence of a bleeder resistor would produce a reading of the value of the resistor.

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.

Testing a magnetron

NOTE: Before you test this component, make sure your microwave is unplugged, and that you have discharged the capacitor.

There are two tests to conduct in order to determine whether or not a magnetron has become defective. If you receive results other than what are detailed below, you will have to replace your microwave's magnetron. Each test is described for you here:

TEST 1: Locate your magnetron and label each of the wires attached to it so that you know which wires are to be replaced where. Set your ohmmeter to the lowest resistance scale. Take a resistance measurement between each of the magnetron's terminals by touching each probe to one terminal each. Reverse the probes and take a second resistance measurement. Each measurement should read less than one ohm.

TEST 2: Set your ohmmeter to its highest resistance scale. Touch one of the meter's probes to a magnetron terminal. Touch the other probe to the metal magnetron housing. Take special caution to not touch the two probes together. This could result in an inaccurate reading. This test should produce a reading of infinity - indicating an open circuit.

Read the tips on the below links on how to replace your microwave oven's diode and how to discharge the capacitor.

http://www.fixya.com/support/r7088355-replace_microwave_ovens_diode

http://www.fixya.com/support/r7088317-discharge_microwave_ovens_capacitor

I hope the above is helpful.

Regards.
Walesarumi

Hi,
Yup.. cap is bad...

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

Microwave Oven Basic Troubleshooting Tips

heatman101

Change the turn table motor part # DE31-10172B
Order from Bi Coastal Appliance Parts @ 1-800-673-1262

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

Microwave Oven Basic Troubleshooting Tips

heatman101 ,./,./l'
';
[\]

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

Microwave Oven Basic Troubleshooting Tips

heatman101

Hi there,
try other buttons on the touch panel and check if it will work. If no other button responds then that means the panel was busted by the outage that happened and the whole panel would need to be replaced.
I do recommend that you contact the manufacturer of your Microwave oven for a 100% compatible replacement part and service.
here's the phone number and the office hour:
Monday-Friday: 8:00AM - 8:00PM (EDT)
1-888-923-8485

Hope this helps!

It is a thermal fuse Ijust don't know where it is located

Actually it can't be "dead" if a fault code is on the display.

There should 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.



It should tell you what the E5 code means, but I would suspect a defective temperature sensor or control board.

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 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.

There is nothing more you can do, you have verified everything is working except it is not heating the food. The next step is have the repairman come in to isolate the cause.

Fisrt check that there are no crumbs or other obstructions on the floor of the oven that would prevent the turntable assembly from rotating properly. Also try removing the plate and lifting up / checking the drive assembly inside the oven cavity to make sure that the turntable drive mechanism has not become disengaged from the motor shaft underneath.

If your problem is not something inside the oven cavity itself, then it may be the result of a simple loose wire to the turntable motor, or it may be a completely burned out motor altogether. Unfortunately the only way to determine the exact source of the problem for sure is to disassemble the unit and troubleshoot the components and connections inside.

A microwave contains a number of very hazardous components such as the main capacitor which can deliver lethal shocks even after the unit has been unplugged. Extreme care should be taken in the disassembly and maintenance of any microwave oven and should be left to a trained technician whenever possible.

Here is a link to the parts diagrams and price lists for your model:

http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5174676


The turntable drive motor is listed as part number 27 on the diagrams. Here is a link to the part details including price for that item if required:

http://www.appliancepartspros.com/part_details.aspx?part_id=4215435

Hope that was helpful. Good luck and take care.

Hello,

The spark is as a result of partial contact. One or two wires inside the microwave is not contacting very well or maybe the heat from the Oven has melted the wires which is causing electrical burnt smell.

You will have to disassemble the oven and check for any burnt wire and re-connect them.

NOTE: Before you attempt to disassemble the unit, make sure your microwave is unplugged, and that you have discharged the capacitor to avoid electric shock.

Read the tip on the below links on how to replace your microwave oven's diode and how to discharge the capacitor.

http://www.fixya.com/support/r7088317-discharge_microwave_ovens_capacitor

Regards.