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Keith Labrecque Posted on Jul 03, 2014
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What is the probably cause of the fan turning itself on?

Model CPBM189kfa

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John Mock

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  • Electrolux Master 932 Answers
  • Posted on Jul 03, 2014
John Mock
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Keith, I am going to assume that this is happening shortly after you may have used the microwave and after sitting for a little while the fan comes on. The fan blows across the transformer and magnetron to help keep them cool. If there is not good air flow the fan will come on and run to get them cool even after the timer has stopped the cooking cycle. If this is a countertop type microwave I would suggest turning the microwave around and check the vent area where the fan is mounted and see if there is a build up if lint and dirt on the vent holes. If there is clean it off with a soft rag and hopefully that should take care of your issue. If this is an over the range microwave/range hood combo you will need to check your filters and probably clean or replace them. Hope this helps.

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1answer

Kenmore microwave model 721.85033010 works fine except the exhaust fan comes on just out the blue for no reason and wont shut off without unplugging.
It turns itself on
  1. Interlock switch If your microwave is turning itself on, the first thing to check is the interlock switch. This is usually the first thing to malfunction that could cause this issue. If the interlock switch is bad then it will need to be replaced.
  2. Main control board If your microwave is turning itself on and the interlock switch is still working, the probable cause is the main control board. If the control board is defective it will need to be replaced.
But before throwing parts at it give these folks a call...

https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Microwave/74-6-878350-/New/Kenmore-Microwave-Turns-On-By-Itself-721-85033010

Best to you
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Sep 02, 2023 • Kenmore Microwave Ovens
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Samsung OTR Microwave, Model# ME179KFETSR, convection fan turns on by itself. If I remove the mounting bolt, the fan turns off. What can be the cause to this?
The screw might be hitting a live wire in the wall which is very dangerous! Make sure there are no live wires where the mounting goes.
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Aug 20, 2019 • Samsung Microwave Ovens
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Have Kenmore microvave and the vent starts on its own
Actually, that's a feature! If you cook much on the range (stove) beneath the microwave, the heat will cause the microwave bottom to heat up quite a bit (just touch it!), and the microwave will turn on it's exhaust fan in an attempt to save itself from burning up. It will shut off in about 15 minutes after you turn off the source of heat.
But if the fan comes on by itself even when the microwave is cool (or at least not hot), then you probably have a defective fan thermostat. This thermostat is located behind the control console on the inside bottom of the microwave.

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

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Aug 27, 2014 • Kenmore Microwave Ovens
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I have a Kenmore microwave. The vent will just start on its own and can't shut off
Actually, that's a feature! If you cook much on the range (stove) beneath the microwave, the heat will cause the microwave bottom to heat up quite a bit (just touch it!), and the microwave will turn on it's exhaust fan in an attempt to save itself from burning up. It will shut off in about 15 minutes after you turn off the source of heat.
But if the fan comes on by itself even when the microwave is cool (or at least not hot), then you probably have a defective fan thermostat. This thermostat is located behind the control console on the inside bottom of the microwave.

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

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Aug 27, 2014 • Kenmore Microwave Ovens
0helpful
1answer

My microwave oven model 721.85033111 vent fan stays on
You probably have a bad fan thermostat. This thermostat is supposed to turn on the vent fan if the microwave oven gets too hot (caused by cooking too much or having too many burners turned on on the range beneath the microwave oven). It should shut off in about 15 minutes after your turn off the range burners. But if it comes on for no reason, or won't turn off, then You probably have a bad fan thermostat.

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

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Aug 10, 2014 • Kenmore Microwave Ovens
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What is the probable cause of the fan turning itself on?
To diagnose i would check if the fan "always" turns on in the start of microwaving a meal? and or if it gets hot and then "always" turns off at a certain time?

if it always turns on and then turns off at a time such as 30 seconds, probably getting hot and over heating - replace fan motor

if it turns on for the first meal but then is off or on intermittenly probably a switch or wiring is loose.
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Jul 03, 2014 • Electrolux Microwave Ovens
0helpful
1answer

Magic chef microwave turns off after about 3 minutes then it just resets again after about 5 minutes
make this test and fix it. God bless you
  1. Interlock switch If your microwave is turning itself on, the first thing to check is the interlock switch. This is usually the first thing to malfunction that could cause this issue. If the interlock switch is bad then it will need to be replaced.
  2. Main control board If your microwave is turning itself on and the interlock switch is still working, the probable cause is the main control board. If the control board is defective it will need to be replaced.
85b709a0-09d7-4210-be3d-4dec36f83961.gif
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Nov 22, 2013 • Magic Chef Microwave Ovens
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Dacor Microwave DCM24S cooling fan continues to run
follow this steps and fix it. God bless you

  1. Interlock switchIf your microwave is turning itself on, the first thing to check is the interlock switch. This is usually the first thing to malfunction that could cause this issue. If the interlock switch is bad then it will need to be replaced.
  2. Main control boardIf your microwave is turning itself on and the interlock switch is still working, the probable cause is the main control board. If the control board is defective it will need to be replaced.

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#9#ixzz2aNH65mG4
http://www.appliancepartspros.com
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Jul 27, 2013 • Dacor DCM24SS Convection Microwave Oven
0helpful
1answer

The inside fan comes on when the door is open.
follow this steps and use the VOM for fix it. God bless you
If your microwave is turning itself on, the first thing to check is the interlock switch. This is usually the first thing to malfunction that could cause this issue. If the interlock switch is bad then it will need to be replaced.

  • Main control boardIf your microwave is turning itself on and the interlock switch is still working, the probable cause is the main control board. If the control board is defective it will need to be replaced.
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    Jun 18, 2013 • LG LMV1630ST Microwave Oven
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    The fan comes on when the door is opened ?
    see the next steps , use the VOM for fix it. God bless you
    If your microwave is turning itself on, the first thing to check is the interlock switch. This is usually the first thing to malfunction that could cause this issue. If the interlock switch is bad then it will need to be replaced.

  • Main control boardIf your microwave is turning itself on and the interlock switch is still working, the probable cause is the main control board. If the control board is defective it will need to be replaced.

    • ca7d2dba-dbe7-4c0f-838d-d60da280bf1e.gif
    Read full answer
    Jun 18, 2013 • LG LMV1630ST Microwave Oven
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