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I just bought a used speed queen CTS99AWN (Manufactured 2006) stackable washer and dryer and it works great up until the rinse and spin cycles. During the fill and wash cycles the drum agitates the clothes 15 seconds clockwise, rests for 9 seconds, and the spins 15 seconds counter-clockwise as it should. However, during the rinse cycles the drum spins for 20-30 seconds at 500rpm and then stops and doesn't spin the rest of the rinse or spin cycle. The rinse function continues as it should, filling with water and pumping it out, followed by the spin cycle with the pump turning on but again it does not spin. The motor leads ohms resistance are within range so the motor is good. Indicator LEDs show NO error codes being generated, the washing machine technically doesn't know that it's not spinning in the rinse and spin cycles. My question is, does the machine control tell the motor control inverter what to do? Is this a problem with my machine control unit or motor control inverter unit? Thank you for any help!-Steven K ps. Belt is in good shape and wiring all looks brand new under the washer. Door switch is fully functional.