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Customer Questions and Answers for Dryer Cycling Thermostat by Whirlpool

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    • Part Number: AP3131939
    • MFG Part Number: 3387134
    • Made by: Whirlpool
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Questions & Answers

For Whirlpool Dryer Cycling Thermostat (Part Number: AP3131939)

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Dryer not turning on, Part #3387134 is the only part with no continuity on the small terminals and when I mistakenly crossed the small terminals with a small screwdriver the dryer did start. Could there be another underlined issue with this dryer?

Mark for Model Number Roper #RED4440VQ1

ANSWER Hello Mark, There is no way that the motor could have started from these two wires being connected or "crossed" since this is the bias heater for the cycling thermostat. This means that a small heater is inside the thermostat and it is used to control the opening and closing of the bi-metal disc at different temperatures. The more power applied to the internal heaters the more supplemental heat is generated to bias the operating temperature of the control. Even if it were the large terminals that were crossed, this still would not supply 120Vac and neutral to the motor to start it. However, if you crossed the 2 wires of the thermal fuse located by the cycling thermostat, and pressed the start button at the same time, and the unit started, then the thermal fuse has failed and will need to be replaced. If it is bad, you may have a kinked or clogged vent which caused this issue. 

Answered by AppliancePartsPros.com   |   Tuesday, March 26, 2013

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