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Customer Questions and Answers for Limit Thermostat by Whirlpool

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    • Part Number: AP4052097
    • MFG Part Number: 489P3
    • Made by: Whirlpool
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For Whirlpool Limit Thermostat (Part Number: AP4052097)

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Our dryer no longer cycles when on the Auto Dry/ Regular setting, you start it at More dry and it will run and run and the dial never moves. The dryer will still work on the Timed dry setting, setting it at 60 minutes, it will cycle through and buzz when the time is up, but it is taking sometimes longer than 2 hours to dry a load of clothes. I cleaned out the entire vent system for the dryer, and tested the cycling thermostat, and it has continuity.

Jeff for Model Number SDG2606AWW Maytag Gas Dryer

ANSWER Hello Jeff, This sounds like you still have a ducting issue. You see, when the dryer is on automatic, it is using the moisture sensors. As long as the sensors pick up moisture, the timer will not get voltage to advance. If the duct is restricted, the sensors continue to sense moisture and the voltage is never sent to the timer motor. The reason for this is that the dryer drum is riding on felt seals. If there is too much back pressure from the exhaust duct, the heat, lint, and moisture will blow past the felt seals right back into the cabinet. When the unit is on timed dry, these sensors are not used, so it gets voltage and times out. The exhaust duct is the most important part of the dryer, even though it isn't part of the dryer. Most people think the heat dries the clothes. If this were true, you could dry the clothes in the microwave. Of course this would just result in hot wet clothes. The heat is an assistance to the air flow, to help to evaporate the moisture. The air flow then carries the moisture away. So, to get to the point, the shorter and straighter the exhaust duct is, the faster the clothes will dry. When you "check" the exhaust duct you're looking for clogged ducting, crimped ducting, and make sure it is as short and straight as possible. The only thing that will cause the timer not to advance in the automatic cycle when it will advance in the timed dry cycle is the duct. If you want to prove it to yourself the test the manufacturer tells technicians to do is to run the unit for five minutes with the duct pulled off in the automatic cycle. You will see the timer advance and this proves the problem to be after the dryer. 

Answered by AppliancePartsPros.com   |   Saturday, October 27, 2012

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