Bickabah for Model Number MDE6400AYW My dryer no longer advances on Auto-Dry cycle. When I set the timer to a timed drying cycle, it works fine. The timer advances for 60 min. and shuts off. The heater element should be fine, because I recently repaired a melted wire to the heating element. I've also checked the vents and they are clear. Is this the thermostat I need to purchase if I find that the current thermostat shows no continuity? Is this thermostat the same as an "internal bias" thermostat? Thank you.
Answer Bickabah, Yes, the WP307249 regulating thermostat is the thermostat you'd need to check first. It does have an "internal bias heater" that should have a resistance of 2400ohms resistance (across the two small, brass colored terminals in the center. It is also a SPDT(single throw, double pole) switch. when the temperature is below 150 degrees the circuit travels across the two lower terminals across from each other and the heater circuit is completed. When the temperature is reached the thermo disc "opens" and the circuit "switches" between the common lower terminal and the upper terminal on the dual side, this supplies 120 VAC to the timer motor and advances the timer until the thermostat resets and starts the heat cycle again. If you're sure the vent and hood are clean and clear, no kinks etc. and the thermostat checks correctly, You'll need to check for a "weak" hi limit switch WP303396 or an air leak in the drum seals or blower assembly. Read More... Answered by AppliancePartsPros.com | Tuesday, December 17, 2013