I recently had a 2-speed motor installed as part of the overall package when I had my pool refurbished. It is a used 1.5 h.p. Hayward motor. I also installed another timer to control the speeds. When the motor tries to start, it makes a humming sound for about 10 seconds and then turns off. There is an odor, possibly ozone or overheated metal. The motor casing is very hot. During this time it does not turn the impeller. I can only get it to start after I open the pump cover and relieve some of the pressure. What do you think is wrong?