Question about Maytag MMV4205 Microwave Oven

2 Answers

MMV4205AAS no light, no fan...then no power

I have an MMV4205AAS that's about 2 years old. One day the internal light and internal fan (not the range fan) stopped working but it would still cook. I talked to a local service guy who said we could still use it as far as safety was concerned. We did for a little bit (a few days) but now there's no display or power. After reading some other posts here I'm thinking the fan that didn't work was the magnetron cooling fan and that when using the microwave the magnetron overheated and killed the thermal fuse on the magnetron thereby killing power to the whole unit. Does this sound correct? What about the initial light/fan problem? Thanks in advance.

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  • 2 more comments 
  • nateNYG Jan 31, 2008

    Yes, power to the outlet is good. No problems there. I haven't checked the internal line fuse. There is no power to the control board which I thought was the only way to really tell if the unit was getting power. Nothing works on it right now.

  • nateNYG Feb 01, 2008

    Not yet. I need to go out today and get a new fuse to try that and get a multimeter to check continuity on the thermal fuse. I found a wiring diagram in the control panel and it looks like for both the cooling fan and the light to go bad it would have to be something in the panel itself. At any rate, I'm going to try to get what I need today to at least get it powered again. I'll keep you updated.

  • nateNYG Feb 01, 2008

    Also, I'm not sure how to fix the rating on this. I don't see anywhere where it will let me change the solution or anything.

  • nateNYG Feb 04, 2008

    I found out the main fuse was good. I jumpered the thermal fuse (magnetron thermostat) and was able to get power to the unit back. I ran it on low for a few seconds to confirm that the light and cooling fan were not working. The turntable and magnetron were both working good. From the wiring diagram the light and fan were both controlled by one relay. I jumpered the relay and both turned on so it looks like the relay is defective.

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2 Answers

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  • Master
  • 729 Answers

That's right. Without the fan to cool-off or to maintain and protect the temperature of the unit, it would slowly cause damage to parts until it get worst... you should have fixed it when it was still early... Unfortunately, It already had caused a deep damage.

Have the fan fixed for temperature control.
The light fixed for your knowing that it is ON or working.
Replace thermal Fuse

Check for other parts, like broken connections or soldered parts.

Posted on Jan 31, 2008

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  • Master
  • 770 Answers

Well part of what you said does sound correct other parts dont make any sense.. Question one is the unit dead now?? have you checked the outlet for power??
have you checked the internal Line fuse to see if it is good??
Does the unit have power to the control board?? these questions need to be answered before we can move on ..As far as the light issue there could be a bad relay on the ctrl board but kets get the unit up and working first

Posted on Jan 31, 2008

  • 4 more comments 
  • Gary Davd
    Gary Davd Jan 31, 2008

    PS: the unit could have gotten overheated and blown the thermal fuse which will also kill the pwr to the ctrl board

  • Gary Davd
    Gary Davd Jan 31, 2008

    You need to also see if you are then getting pwr to the control board too pwr the rest you can as a temp jumper it out and see what else yo uwill need to replace

  • Gary Davd
    Gary Davd Jan 31, 2008

    And also fix your rating on this job I gave you the answer you were looking for before Lemmor posted Thanks

  • Gary Davd
    Gary Davd Jan 31, 2008

    Did

  • Gary Davd
    Gary Davd Jan 31, 2008

    Did you

  • Gary Davd
    Gary Davd Jan 31, 2008

    get it fixed??

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1 Suggested Answer

sharcnet
  • 2124 Answers

SOURCE: No light, internal fan...then no display

The light isn't a safety issue but I would think that the fan would be.

The fan is designed to remove excess heat from unit and keep it cool. Without the fan, you're now operating the unit under conditions that it wasn't designed for.

With the unit unplugged, try removing the cover and see if a fuse has blown. If so, replace it with the EXACT value of the original.

See if the unit powers up again. Try heating heating up something for 30 seconds to see if the Magnetron is still functioning.

If so, check to see if the bulb is good. Did the bulb and fan stop at the same time? If so, it might be something in common that controls both.

Don't operate it further until you have it looked at. You don't want to cause something else to fail.

Good luck!

- Jim

Posted on Jan 31, 2008

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