Question about Microwave Ovens

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Microwave heats outside too.

My microwave emits warm air from the vents and feels warm to the touch when it heats longer than 5 minutes. Is this a sign of malfunction? Is it time to get rid of the thing?

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This is normal. However, if you are worried that your microwave is old and may be leaking radiation you may want to replace it, as they are actually under one hundred dollars for the most part; or you can get a little microwave radiation test kit at home depot or lowes for about twenty dollars.

Posted on May 20, 2009

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Back panel of microwave gets hot while in use


would you not also get hot when in use . if you were heating food to be totally cooked .that is why they have a fan in them

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Heating problems Jenn-air microwave - jmv8000bds - it heats while unused for a while but to warm more than the first item is not working - what is broke? jeffrey40@yahoo.com


First, check to make sure that the air vents are clear. Secondly, is the cooling fan running? If these are OK, (how old is this unit?) it's probably the magnetron is old and weak....... Put in a container with 2 quarts of cold water and run it for 10 minutes. It should boil water after about 4 or 5 minutes and keep boiling it for the remainder of the timer preset. If not, the magnetron is losing power.

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We purchased a home with the built in model mc0153sf serial # DJ07X01113. we do not have a operators manual. the microwave shuts down when we do a ...


Yes! if the microwave does not have proper ventilation it will go into shutdown, causing it to over heat. The thermal fuse will open if to much heat is detected and can take 30 minutes or more to reset before you can use it again.

Mar 18, 2011 | Microwave Ovens

1 Answer

Ge spacemaker xl-1800 microwave shuts off if used longer than 3min.


That would be model "JVM1540SM1SS".

This is due to overheating of the magnetron.

Attached to the magnetron is a thermostat, which opens to interrupt power if the heat gets too high. Then when it cools, the thermostat closes, restoring power.

An overheating magnetron can be due to:
  • operating oven without cover(s) in place
  • wrong magnetron installed in oven
  • an old or otherwise failing magnetron
  • cracked magnetron magnet
  • improper power line voltage (should be 110-125VAC)
  • foods low in moisture (popcorn & bacon, e.g. - add 1/2 cup of water in rear oven)
  • failed or inoperable cooling fan or hood vent exhaust fan
  • deteriorating foam weatherstripping seals in air ducts or on outside cover
  • blocked air vents (dust, animal nest debris, insufficient free air space behind & around oven, etc.)
  • clogged or greasy charcoal filter or grease filter
  • blocked duct in hood vent exhaust
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.

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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.

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

WMH 1162X VS -1 (watts unknown) Builder purchased


If the oven is set up to vent outside, then the metal mesh grease filters are used, and they should be cleaned in warm soapy water whenever they look greasy or dirty.

If the oven is set up to recirculate, then the charcoal filter is used, and it must be replaced (not cleaned) every 6-12 months, depending on use.

This model does not have a separate cooling fan like most other models. It replies on the vent fan for magnetron cooling, so if the filter(s) gets too dirty, it can reduce the cooling air flow, which can allow the magnetron to overheat and be destroyed.

I would need to know a little more to help narrow down the "no heat" problem.

If the cooling fan, turntable, and inside light all come on when you press "Start" to cook, then I would ask if you here a "thump" when you press "Start."

If so, then the high voltage section is getting energized. If not, then it may be the cook relay on the control board, which I can affordably repair.

The support page for your oven is here, and it has manuals and part lists you can download.

For more free DIY and other help & advice, feel free to contact me with your full model number and FCC ID number from the tag on your oven.

William E. Miller, AS-EET
pupista@gmail.com
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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I used my GE Sensor Microwave oven tonight to cook a frozen macaronni and cheese. The cooking time was 16 minutes on high. The oven was noticeably blowing out hot air and very warm to the touch on the...


It will normally get pretty warm after a minute or two of cooking, but the important thing is to be sure the vents are not clogged or blocked, and that the internal cooling fan is working.

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Hi,

I would suspect that when the microwave oven was on the table the vent or air openings were restricted by the table. Without free flowing air the control and other components could build up heat. It is doubtful that you built up enough heat to damage anything as this unit has more than one over temperature safety devices built into it.

That being said, the excess heat could weaken something internally especially on the control that would cause it to fail sooner than later in life.

My advice would be to leave it unplugged until it is mounted back on the wall per the instructions and use it then as normal. If it fails in the next year or so replace it at that time.

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If your range hood or microwave recirculates back in to the room.

Both filters are required. The mesh filter catches the grease & air particulate. The carbon filter should be changed regularly www.HoodFilterFactory.com ( avoid range fires that spread quickly) & clears the recirculated air from smoke,odors, & airborne particulate.

With yours venting to the outside, you ONLY need the mesh filter. These filters should be cleaned regularly ( Avoid mentioned hazard) & should be replaced when you can no longer clean them enough to see through them when holding up to the light.

Good Luck

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As long as it's not too hot to touch, and you feel air moving through the vents when it's running, it should be okay.

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