Question about LG Microwave Ovens

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Closed door on LG LMV1831ST OTR microwave & fan started running on high & will not turn off. Range below microwave was off. Turned off breaker to it for long periods of time - no change.

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  • LG Master
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Quite possibly the door switch has failed . might cost about 100.00 to get fixed ,

Posted on Nov 28, 2015

  • ray gallant
    ray gallant Nov 28, 2015

    quite possibly the door switch has failed . might cost about 100.00 to get fixed ,

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Fan runs when door is closed - no heat

This is normally 1 of the interlock door micro-switches not working.

Posted on Jun 20, 2007

fridgetech
  • 473 Answers

SOURCE: Panasonic NN-2501 Microwave Oven range hood

It is possible that the magnatron is bad but hard to say on a no heat problem without checking all components. A lot of model give 5-7 yr warranty on that part.

Posted on Oct 05, 2007

  • 4102 Answers

SOURCE: frigidaire microwave won t turn off

this is a problem with your programme timer these can be expensive to replace and because of the age you will probably be better buying a complete new unit as you could repair it and you could come across other related problems and could end up spending a fortune sorry i couldnt be any more help

Posted on Nov 08, 2007

MicrowaveSvc
  • 9174 Answers

SOURCE: LG LMVM2055SB over the range microwave keys not working

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?

Posted on Nov 18, 2007

MicrowaveSvc
  • 9174 Answers

SOURCE: Sharp microwave runs when door closed

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

I would suspect the door switch mount has a broken tab allowing the switch to swing down when the door is closed, not allowing it to really be activated.

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

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 a friend 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 order Sharp parts from Tritronics at http://www.wehaveparts.com

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

Posted on Mar 02, 2008

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Does this happen while you are cooking on the range burners under the control panel?? These type microwaves have a heat sensor built into them in the area of the control panel bottom. If the microwave control gets too hot from cooking on the stove below it the heat sensor will turn the fan on to keep the control panel from getting heat damage. The fan should go off after everything cools off.

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Spontaneously stops working and then comes on after 5 minutes. Why?


Sounds like the magnetron is overheating. There is an automatically-resetable thermal circuit breaker attached to the magnetron. Most likely your problem is caused by either a cooling fan that is not running, or is running too slow (caused by gummed-up bearings). In some over-the-range (OTR) microwave ovens, the exhaust fan is run at a slow speed to cool the magnetron, and if it's bearings get gummed up, it won't run on the slow speed. But if it's a new OTR microwave, then the exhaust fan may be pointing the wrong way. (It is rotatable, depending on the installation). For example, if it is pointing up, but you don't have an exhaust vent over the microwave, then the air has nowhere to go, and the magnetron will overheat.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

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Why is the microwave running without being turned on?


These above range microwaves "hoods" automatically turn on a cooling fan even when the microwave is not in use. If you read the manuals you will see warnings about the fans automatically starting. Even when the microwave is not in use opening the door likely interrupts the power to the automatic cooling fan.

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My microwave shows nothing on display and will not turn on


see this causes and fix it. God bless you
First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.

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1 Answer

LMVM1935SB - Over the Range LG - fan keeps coming on, beeping


The fan will come on if you are cooking below and the area gets hot.... is this when it happens? Sometimes random beep could be a power blip... not long enough for a reset of all things electrical

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1 Answer

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THE OTHER SOLUTION STILL WOULD BE A CONNECTION PROBLEM ON THE KEYBOARD ITSELF-THE WIRES JUST PLUG ON THE CIRCUIT BOARD BEHIND THE KEYBOARD---STILL A EASY REPAIR--GOOD LUCK TUNICA

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1 Answer

Fan runs when door is closed - no heat


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