Whirlpool GEW9879PW dryer. The motor runs only when the PTS button is depressed, like so many others. I followed the tech sheet tests, read the forums and replaced the Electronic Control Assembly (part # 3976623) even though the old one had no visible damage. It didn't help.
The timer, heater and door switch work normally when the button is depressed. The thermal fuse has continuity and there is no vent blockage. I tested the motor relay (part # 3405281) by switching wires with the heater relay (same part #) and that didn't help either. I have ordered a new motor relay anyway just to be sure. What am I missing?
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Several different components could be preventing your dryer from continuing to run when the start button is released. The wiring diagram and other technical information for your dryer are shown in the image below. When the start (PTS or Push To Start) button is pushed, the PTS contact is closed and voltage is supplied to the drive motor. Start voltage is also sensed through the blue/black wire that is connected to the P1-5 Start Sense pin on the control board. When the control board senses the start voltage, it normally applies 48 volts DC voltage through the Pink/Black wire to the motor relay to hold the contact closed between the two blue wires attached to the motor relay that supplies normal run voltage to the drive motor. With the start button taped down, the motor continues to run since it gets voltage through the closed start button. Since the motor stops running when the start button is released, it indicates that you have one of these 3 failures:
Broken or disconnected Start Sense wire.
Failed electronic control board that is not sending the 48 volts DC voltage through the motor relay Failed motor relay. Wiring failure between the components.
Since the motor relay and the heater relay are both exactly the same part, you could unplug the dryer and switch the motor and heater relay to see if the dryer will stay running. If it does, then you just need to order and replace the bad relay.
The push-to-start switch rarely causes the dryer not to start. It doesn't necessarily mean that the PTS is out if the dryer doesn't start. What usually causes this problem is the thermal fuse blown. The thermal fuse, located on the blower housing along with the cycling thermostat, is wired in series with the dryer motor. Power to the motor is then terminated and it cannot run when the thermal fuse blows either due to a restricted duct or malfunctioning thermostat. Make sure the vents and ducts are clear. Click on the link below for the detailed troubleshooting and repair. The thermal fuse and cycling thermostat are part numbers 3392519 and 3387134, respectively.
No problem at all.The motor has a start and run winding.Your run winding is bad.The reason you have no heat is the run winding has to run to close the contacts on the motor switch.Replace the motor ,both problems solved. Hope this helps Please rate my response :)