Question about Whirlpool MT9160XE Microwave Oven

2 Answers

The clock works and can be reset to a different time. You can put in on for 30 seconds to cook and push start and the light comes on and it counts down the time on the keyboard but it does not heat the substance.

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  • ncfosc19 Aug 27, 2010

    The fan is not coming on. Does that change the situation?

  • ncfosc19 Aug 27, 2010

    The fan does not come on. Does that change the analysis?

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2 Answers

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HI. Your symptoms are a strong indication of Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.

The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.

Posted on Aug 28, 2010

  • Michael Masters
    Michael Masters Aug 28, 2010

    Concerning the fan; If the fan motor has failed, that will be the reason for the failure of the magnetron heating device. Without proper air flow, the magnetron will overheat and fail. The job of the Cut-off fuse is to prevent the failure by shutting down the magnetron and cutting the heating circuit. This is why you should test the fuse first, if possible. If the fuse is ok, the magnetron will need to be replaced along with that failed fan motor assembly. Again: you must discharge the capacitor before testing any components in a microwave oven. You could risk serious injury if not done correctly. If you are not familiar with the proper discharging methods of a HV capacitor, I would advise to contact your local Microwave service tech for this repair.

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  • Master
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Hello,

If a user sets up a microwave and turns it on, one would expect it to heat the food in it. If it doesn't, it has probably developed an electrical fault. If everything comes on when it is started, like the light in the cavity and the fan (which one can hear running), and the timer counts down but it doesn't heat, the problem is probably isolated to the high voltage section of the oven.

9 Out of 10 Times when there is no heat and everything else works fine it is the Magnetron. The other 1 from the 9/10 is the HV (High Voltage) Diode that connects to the HV Capacitor.This is the cheaper fix of the two with them being usually under $12. The Magnetron is rather high ranging from approx. $50 and up.If you look on Ebay you generally can find many replacement parts that are in good working order and save some bucks.There are Magnetrons going for $18-25 on average and Diodes for $3-12.If you have a rather loud HUM coming from your micro-it is then generally the Magnetron.IF anyone does get inside their micro PLEASE MAKE SURE TO GROUND OUT&DISCHARGE YOUR CAPACITOR Before doing Anything! You can find the info to do it by searching on the web. There is very much high voltage inside these EVEN AFTER you unplug it and can hurt or kill, please note that.

Take care.

Posted on Aug 27, 2010

  • Jimoh Adeleke Muyideen Aug 27, 2010

    Hello,

    If the fan is not running, the fan element has blown.
    This usually cannot be seen without taking the fan cover off inside the
    microwave oven.

  • ncfosc19 Aug 27, 2010

    does this keep the unit from cooking/warming up a substance

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Sometimes oven does not work. when ya hit start it just clicks - the screen looks normal for about 2seconds & then shows the clock time.


Sounds like is what's happening:

Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back.

That would be a bad upper interlock switch and charred connector. If so, see:

http://031d26d.namesecurehost.com/mwd/safety.txt
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Sounds like you have a faulty control panel. I would use a meter and test the power from the control board to the magnetron and circuit board. Chances are the control panel is faulty

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The owner's manual is here. On page 10 we find:

COOKING IN ONE STAGE
1. Press the POWER button; the Microwave and High
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2. Press the POWER button different times to set the
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We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.


Sep 08, 2009 | Emerson Microwave Ovens

1 Answer

Turns itself off after only running 2-3 seconds


See if this describes what's happening:
  • Put in time, push start and unit runs for 2 seconds, relay clicks, unit goes off. Cook time on display goes off and clock time comes back. Bad upper interlock switch and charred connector
If so, see http://www.microwavedisplay.com/safety.txt , http://www.microwavedisplay.com/disassembly.txt and http://www.microwavedisplay.com/doorsw.txt

Otherwise, if the digital programmer circuit / controller does not get a feedback signal from the inverter for a period of 3 seconds, the controller will stop the cook cycle.

It may be a loose connection in the wiring between the inverter, magnetron, and/or control board, or maybe one of those components has failed.


Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

You can find an authorized Panasonic servicer here.

In Canada, you can find an authorized Panasonic servicer here.

If yours is not a Panasonic, Please reply back with your brand and model number so we can help you.

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

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The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

Then let us know if the hard reset does not fix it.
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The first thing to try is a "hard reset". Unplug it from the power line for a few minutes, plug it back in, set the clock, then try again.

Let us know if the hard reset doesn't fix it.

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

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