Question about Maytag MMV4205 Microwave Oven

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No light, internal fan...then no display

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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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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2 Answers

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


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

Jan 31, 2008 | Maytag MMV4205 Microwave Oven

1 Answer

Hi I have a Samsung SMH9187 micowave that is dead (no display, light, fan, mirowave).


Sounds like the main fuse blew. It's either near where the power cord enters the cabinet, or behind the control panel (if an over the range unit).

You may also have some type of failure in the high voltage circuit; based on your description of the symptoms.

Aug 16, 2014 | Samsung SMH9187ST Microwave Oven

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I have a 20 year old GE JCM140H over the range microwave which has always worked just fine. Last week everything just "died" no lights, no fan, no display, no microwave. I thought that I had...


You'll have to remove the cabinet cover to access the fuse. It is in line with the power cord. 20 Amp, slow blow.

One of the screws on the back of the cover may be a security TORX (the kind with a pin in the center of the head). Usually, if you tap on it with a hammer, you can remove it with a pair ov Vise-Grip pliers.

Jan 05, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

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Model is GE JVM1430BD002. Microwave works but range fan and lights do not. Unit "popped" when fan was turned on one time and hasn't worked since. Is there a fuse or breaker for the range hood functions?


Yes - there is an internal "special" in-line fuse. Most likely it is the fan that has caused it. Clean the fan with switch-cleaner spray and make sure it is smooth running. Replace special fuse with identical version.
Check lights before operation.
Replace all covers before test.

Oct 10, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave dead even though power works


It sounds like the magnetron overheated and opened the thermal fuse on the magnetron.

This can be caused when the internal cooling fan is not running or by a magnetron that is failing.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

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.

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

The magnetron will have a 5 to 9 year warranty. Your manual will tell you that.

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

If needed, GE may send you a replacement magnetron. GE Customer Service is here.

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

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1 Answer

Samsung MU3250W Shut down


It could have been steam or humidity.

If this is an over the range model, be sure you always use the hood vent exhaust fan when you're cooking on the stove top.

Whether it's a counter top or over the range top, always be aware that the cooling fan is running when it's cooking.

When in doubt feel for air flow through the vents.

Good luck.

Oct 19, 2008 | Samsung MU3250W Microwave Oven

1 Answer

Deep humming sound


This usually means the magnetron is failing.

Just be sure the internal cooling fan is working by making sure you feel air flow. If not, call for service right away.

The magnetron part cost is covered beyond the normal 1-year warranty, so when it gets worse or stops heating, you'll have to call for service.

To find an authorized Samsung servicer, look here.

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

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Is it possible someone may have sprayed cleaner directly onto the keypad area?

This causes moisture to get into the keypad and sometimes onto the control board.

This could mean that they control panel frame with keypad (membrane switch) would need to be replaced.

Can you give more details on the cleaning?

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