I read the postings and responses to this problem, and did not find a solution. I read that 99% the time, it is the limit switches that are the problem. I am a one-percenter. I checked the switches, and they are fine. I removed the motor from the valve gears, and it works fine. When the motor is replaced and power applied, I hear the motor trying to turn, but it cannot. With the motor installed, I cannot manually turn the valve with the switch in the middle (off) position. If I remove the motor, I can easily turn the valve manually. I can also easily rotate the shaft on the motor with my fingers. It is only when fully put together that the motor will not turn the valve, and the valve cannot be turned manually. Any suggestions? Thanks!