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Jason peddycord Posted on Oct 18, 2018
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The vent fan on my microwave comes on by itself. LED says it will run until heat is no longer sensed. Has my low limit thermostat gone bad? Is this an easy fix?

Whirlpool model mh1170xsy-0

1 Answer

William Miller

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  • Whirlpool Master 9,179 Answers
  • Posted on Dec 15, 2018
William Miller
Whirlpool Master
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Joined: Sep 15, 2006
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Have you had trouble with the cooktop lights recently? The circuits for both lights and fan can be affected if so.

Does it happen when you are not cooking on the stovetop?

Your product support page is here, where you can get the owner's manual, installation instructions, parts list, etc. You can order Whirlpool parts from the Pros here.

If your controller needs repair, I do that. Details here.

5 Related Answers

MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Mar 29, 2007

SOURCE: New microwave; loud fan when heating items

Since you say it's new, it should be under warranty. I would call GE (see your owner's manual) to get a local authorized service center. Then while you're on the phone with the service center, you can start it up and hold the phone close to it to demonstrate to the technician how loud it is. They should be able to tell you if it will be covered under warranty so you get it fixed free.

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MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Mar 20, 2008

SOURCE: MIcrowave oven stopped heating - Whirlpool MH6150XMS

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.

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

MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on May 09, 2008

SOURCE: Whirlpool Gold Microwave Model GH7155XHS

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

Please feel free to contact me directly if you need more help.

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

William E. Miller, AS-EET
[email protected]
http://www.microwavedisplay.com

MicrowaveSvc

William Miller

  • 9179 Answers
  • Posted on Aug 06, 2008

SOURCE: Whirlpool Over the Range Microwave won't heat

Yes, I'm trying to help you. Sorry about all the questions, but it's part of diagnosis.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose or corroded connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron
- shorted high voltage diode

At this point, it seems pretty clear that the problem is in the high voltage section, most likely the magnetron, but possibly the high voltage diode or transformer..

Here are some links you or someone you know can use for test help to find the defective component, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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

Anonymous

  • 2992 Answers
  • Posted on Jan 26, 2009

SOURCE: microwave wont heat

The manual says "while in standby mode, press and hold the '3' key on the keypad for 3 seconds until 2 tones sound and the 'DEMO' icon appears. Repeat to turn demo mode off."

You can download a copy of the manual here:

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Use%20and%20Care%20Guide%20-%208206572.pdf

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see the steps and use the common sense:
God bless you
All microwaves have some sort of a cooling fan to help keep the magnetron and controls at a tolerable level. Most OTR models will usually use the vent motor for the cooling fan also. Countertop units have a small fan behind the control panel somewhere. Either way, if the cooling fan is not working and heat builds up, it is going to open a thermostat. On some makes, this thermostat might re-set itself as soon as the temperature cools down. Other makes, you will have to replace the thermostat or fuse.
If this is your microwave oven repair problem, you will need to check the operation of the fan. Below in the component testing chart, you will see how to test the fan. Also, if possible, make sure the fan is not obstructed somehow and not turning. Also check your fan relay at your control board for voltage, if no voltage, replace control board. This fan should come on at the same time any cooking starts.

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proceed with common sense, clearly, and logically.and fix it .God bless you
Microwave overheats and keeps turning off All microwaves have some sort of a cooling fan to help keep the magnetron and controls at a tolerable level. Most OTR models will usually use the vent motor for the cooling fan also. Countertop units have a small fan behind the control panel somewhere. Either way, if the cooling fan is not working and heat builds up, it is going to open a thermostat. On some makes, this thermostat might re-set itself as soon as the temperature cools down. Other makes, you will have to replace the thermostat or fuse.
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