Randy O Rockton , IL March 28, 2015 Appliance: Whirlpool Washer WTW6400SW2 Whirlpool Washer Wtw6400sw2: Washing machine would not go into spin cycle after doing rinse display showed f50 error code online search indicated problem with rotor position sensor. How to replace Rotor Position Sensor Kit. Installed new RPS kit and washer worked fine. When removing old RPS kit discovered damaged wires at sensor connection causing error code. 11 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes