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Customer Questions and Answers for Thrmst-Fix by Whirlpool

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    • Part Number: AP3868411
    • MFG Part Number: 8557403
    • Made by: Whirlpool
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For Whirlpool Thrmst-Fix (Part Number: AP3868411)

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My dryer will run a little bit then shuts off. When it stops it gives a code F-40. Could this be a thermostat?

Jim for Model Number 110.67062600

ANSWER Hello Jim, The F-40 fault code is a communication error between the machine control board and the motor control board. The first thing you should do is unplug each connector and reconnect them one at a time. This could correct the issue if it is just a connector not making good electrical contact. If this doesn't correct the issue, go to page 8 of the tech sheet inside the machine. The procedure is as follows: 1. Access the motor control electronics. 2. Visually check the communication harness. The communication harness is a three-wire harness that connects between the two electronic control assemblies. Make sure it is fully inserted into both electronic controls. 3. If the communication harness looks OK, go to step 4. 4. Visually check the wire harnesses connected to the motor control electronic assembly. Make sure they are clean and fully inserted into the control. ? If the connections look OK, go to step 5. 5. Remove the MC2 blower motor electrical connector from the blower motor electronic control. 6. Measure the resistance between the following terminals on the connector: pins 1 to 3, 1 to 5 and 3 to 5. The resistance should be between 55 and 65 ohms. ? If the resistance looks OK, go to step 7. ? If the resistance is much greater than 65 ohms, go to step 7. ? If the resistance is much less than 55 ohms, replace the blower motor. 7. Visually check the wire harness connection at the blower motor. ? If the connections look OK, check for obstructions in the blower housing. Make sure blower fan rotates freely. ? If no obstructions are found, replace the motor control electronic assembly. 

Answered by AppliancePartsPros.com   |   Thursday, January 17, 2013

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