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Microwave not heating unless exhaust fan is on high

I have a Maytag combination range hood/microwave. It's 5 years old. Recently it started not heating from time to time. Even more recently it wouldn't heat every time. Yesterday I figured out that it works perfectly if I turn the exhaust fan on high. Low does not work. In fact if I turn the microwave on without the fan on high I can hear it not working but as soon as I turn the fan on high I hear the humm start up.

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  • Anonymous Mar 29, 2014

    cannot turn range hood exhaust fan off

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Check the control unit and high voltage circuit, and megnetron, high voltage diodes, wiring and high voltage fuse etc.,

Posted on Sep 27, 2007

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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1 Answer

Mmv5165bas vent fan will not stop running


Check to see if there's a relay providing power to the fan. If there is, the contacts might be sticking in the closed position. Assuming that this is an over-the-range unit, disconnecting the vent fan completely might not be a good idea as heat/steam from foods cooking on the range would more likely damage the microwave.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

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Whirlpool microwave hood combination won't heat


There are three common issues, the magnetron "heats food" a cracked high voltage diode, a shorted high voltage capacitor.

Mar 10, 2012 | Whirlpool Microwave Ovens

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Everything (lighting, hood fan, etc) is working on the microwave except it is not heating. Would prefer to get it fixed than buy a new one.


Hi,

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

Microwave Oven Basic Troubleshooting Tips

heatman101

Sep 03, 2010 | Maytag Appliances Over-the-Range Microwave...

1 Answer

We have a model # mmv1153bas over the range microwave. When heating or cooking items longer than a couple minutes the unit shuts off and remains off for at least 1 hour. It is not the breaker or the plug...


If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

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
We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

It is vital that the cooling fan runs, or the magnetron will be destroyed. Repeated shutdowns like this are endangering the magnetron, assuming it's not bad already.

Your owner's manual will cover checking the filters and will cover warranty terms. The magnetron may still be covered.

If for some reason you don't have your manual, you can download it here.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

May 25, 2010 | Maytag UMV1152BAS Microwave Oven

1 Answer

Maytag Microwave apprears to work but does not cook


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

Basic Microwave Oven TroubleshootingTips

heatman101-==-

May 17, 2010 | Maytag MMV4205 Microwave Oven

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My microwave became very loud and will not heat. it is 5 years old and happened suddenly.


If it is a loud buzzing noise it is either the diode or magnetron. Working with the high voltage of a Microwave oven I would never recommend anyone other than a trained professional to attempt this repair.

Apr 24, 2010 | Maytag 2.0 Cu. Ft. Over-the-Range...

1 Answer

I have a Maytag microwave, model# MMV5165BA and it has no heat.Everything displays and vent works but no heat.Can you suggest anything before I toss it out?


If it operates as normal but items don't seem to get hot it probably is a Magnatron failure (microwave producer). More times than not the repair / replacement of a Magnatron these days is not worth the investment, especially if the microwave is 4 years old or older ! You should be able to replace your microwave with a similar featured microwave / hood for about $300 to $400. You might try a JVM1750DMWW by GE great micro/hood for about $300, includes one touch sensor cook capabilities,300 CFM vent fan,removable rack,option to turn the turntable on or off, 1000 watts of cooking power. Good luck !

Nov 28, 2009 | Maytag MMV5165 Microwave Oven

1 Answer

Exhaust fan


the fan may be clean, may be fan bush struck thats why fan running not properly, check the internally inside the microwave oven , you should carefull inside micro wave oven very high voltage .

Aug 05, 2007 | Maytag MMV1153A Microwave Oven

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