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Why does my Kenmore dryer keep blowing the Heat Cutoff switch even though I have cleaned the vents?

I have a Kenmore electric dryer model 110.67902790. It keeps burning the Heat Cutoff switch. I have cleaned the vents. I replaced the cutoff switch, but it burned out again. I am not sure if I have mis-connected the Black and Red wires on the Heating Coil box. Please help me! I need a working dryer ASAP.

Dryers , Kenmore , Washers
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1 Answer from this member:
Lyle W
The wiring diagram for your dryer is shown in the first image below. You can use this diagram to check the wiring on your components (with the dryer unplugged).

Once you verify that the wiring is correct, I recommend that you temporarily connect the wires together for the thermal cut-off fuse (with the dryer still unplugged) and conduct the following test:

Make sure that the lint screen is clean. Wash it with water and a nylon brush to remove fabric softener residue that can build up on it. When it is completely dry, replace it in the lint screen housing.

Disconnect the flexible vent hose behind the dryer so that it will vent directly into the laundry room. Ventilate the laundry room as much as possible. Position the dryer so that you can measure the temperature of the air coming out of the exhaust vent behind the dryer.

Load the dryer with a medium load of towels or garments that can tolerate the high heat setting.

Start a timed cycle on the regular high heat setting.

Measure the temperature of the air coming out of the vent in the back of the dryer.

The dryer should heat up to about 150 degrees and then cycle between 140 and 150 degrees.

If the dryer is heating and cycling properly, then a restriction in the exhaust vent to the outside of the some is likely causing your thermal cut-off fuse to blow. You also could have a high limit thermostat that is stuck closed since it should open at 250 degrees and prevent the thermal cut-off fuse from blowing.

If the dryer heats continuously and the temperature rises above 280 degrees then you will need to stop the dryer. This type of problem is often caused by a heating element that is shorted to the cabinet ground. It is possible that you could have a cycling thermostat and high limit thermostat that are both stuck closed but it is rare for 2 components to fail at once. I recommend unplugging the dryer and pulling the heating element out to check for damage if the element constantly heats.

This test should help you determine the cause of your heating problem.

Do not leave the thermal cut-off fuse bypassed

and continue to run the dryer. This fuse must be replaced again. Once you determine the cause for the heating problem in the dryer, the fuse should not continue to blow.

If you need more help, resubmit your question with additional details.
by Lyle W Earned 136,254 community points in Kenmore
June 29th, 2009
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