The Whirlpool Duet Washer F06 Error means the main control can't detect the speed of the motor. It's classified as a Drive Motor Tachometer Error.
This error can be caused by a poor connection between the motor and the motor control unit. Check the connections and wiring. If the wiring looks good and the connections are tight then replace the motor. The page linked below has the part information and replacement instructions for the motor.
This Whirlpool Duet Washer F06 error troubleshooting and repair information applies to model GHW9150PW0 and all the models listed under the related models section below.
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