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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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OTR Samsung Microwave fan comes on with no reason. Any way to fix it?


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.

Apr 13, 2015 | Samsung 1.8 Cu. Ft. Over-the-Range...

1 Answer

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

Oct 16, 2014 | Microwave Ovens

1 Answer

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.

Jul 29, 2014 | Whirlpool GH7155XHS Microwave Oven

1 Answer

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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Sep 27, 2012 | Maytag Appliances Over-the-Range Microwave...

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

Apr 19, 2009 | LG LMVM1935 Convection/Microwave Oven

1 Answer

Whirlpool OTR microwave no oven 'fan'


FIRST ,,MICROWAVE OVENS ARE REALLY SAFTY MINDED AND THATS A GOOD THING....THERE ARE USUALLY THREE DOOR SWITHCES NEXT THE KEYBOARD--THE ONE ON TOP AND THE ONE ON BOTTOM ARE PRIMARY AND SECONDARY SWITCHES,,YOUR PROBLEM SOUNDS LIKE ONE OF THESE IS NOT MAKING CONNECTION..YOU MIGHT BE ABLE TO PRESS 'DOWN" WITH A LITTLE PRESSURE ON THE DOOR AFTER CLOSING TO SEE IF THE FAN WILL START,,,IF YOU NOTICE --THERE ARE 2 LATCHES(HOOKS) COMING OUT OF THE DOOR,,WHEN THE DOOR IS CLOSED,THOSE LATCHES ARE SPRING LOADED AND MAKE CONTACT ON THOSE SAFTY SWITCHES....THIS IS NOT A CUSTOMER REPAIR--MICRO'S ARE JUST TO DANGEROUS WHEN YOU TAKE THE COVER OFF--IF THIS DOES BRING THE FAN BACK ON--YOU GOT A BAD DOOR SWITCH AND SHOULD BE A REASONABLE REPAIR
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

Oct 30, 2008 | Microwave Ovens

1 Answer

Dacor PMOR 30SS 1100


jamison665 was you using the microwave when this happened? Reason I ask is that all microwaves over the range have a temp sensor so if you are using the cooktop and don't have the vent fan on the OTR running, it will turn on the fan if it gets to hot. Once this cools off, the fan will quit running. When this happens, it is only the fan that is running. I think this may be it since the turntable will rotate when the mircowave cooking section is in use.

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1 Answer

Fan runs when door is closed - no heat


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

Jun 20, 2007 | Sharp R-1490 Microwave Oven

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