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My Son's dryer shuts down about 20 minutes into the drying cycle

My son has a Kenmore 90 series; model number 67902790. When he goes to dry clothes, the dryer works about 20 minutes and then it shuts down. The curcits have all been checked and are ok. What is he suppose to do? Under products you do not list the model or model number for the kenmore he is having problems with, so I listed the next best thing.

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Most dryer heat related problems can be attributed to poorly installed, kinked or clogged dryer ventilation ducting. It sounds like the Thermal Fuse may be beginning to fail. I have experienced this problem on only one other occasion. Normally the Thermal Fuse will blow (like a fuse is supposed to) and has to be replaced. However, I did have a problem similar to yours where the fuse would trip when it was hot, but when it cooled, the dryer worked fine. Now if you are having problems with the Thermal Fuse tripping, its generally for a reason. If the dryer exhaust vent ducting, or dryer interior has not been checked or cleaned recently, I would recommend doing so now.

A simple test that you can try is to remove the dryer vent hose from the back of the dryer and dry a load of clothes as you normally would. The air coming out of the exhaust vent should be forceful and warm (about 140 degrees F). If your clothes dry normally, with no problems, I would recommend checking the ducting at the point where it leaves the dryer to where it exits your home. Locate and fix any sags, kinks or choke points that can lint to accumulate and clog.

If you have weak air flow, or if the dyrer shuts down like you been experiencing, I would begin by checking the dryer interior for clogs. In most cases, the dryer blower fan housing becomes built of with lint and can cause the dryer malfunction.

Cleaning the lint screens on these dryers is not always enough. Routine inspections of the dryer ducting and cabinet interior should be done about every 3 months. A dryer that remains in a clogged condition will actually run hotter, but dry less efficiently. This causes the heating circuits to run at higher temperatures. Sometimes to the point of failure. The also can cause a fire hazard.

The Thermal fuse is a small plastic looking component mounted on the blower fan housing with 2 wires attached to it. The other component that you may have on the blower fan housing is the operating (or bias) thermostat. It usually has 4 wires attached to it. With the dryer UNPLUGGED, you can disconnect the wires on the Thermal Fuse and take a resistance reading. It should read a short (0 ohms) if good. If bad, this reading will change when the component gets hot. The way I isolated my fault was to run the dryer until it failed, then took a quick resistance reading.

Let me know if you have any questions. I hope you find this information helpful.

Posted on Jun 27, 2009


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