Ruud achiever 90 plus blower not working

Question

I have a Ruud Achiever plus heater with heat pump. The furnace blower goes on & off and makes a large clicking sound in the unit. Now the fan will not work at all but the heat pump is running fine. I've shut down the system so I don't burn up motors. Also, the fan blower turns freely. The light inside the furnace is continually blinking. Any suggestions? Also, where do you get parts for these things?