... it was a replacement for the original. My question is, because I woke up to it humming and then it started but never shut off until the hi-limit switch was reset, can I put in a different motor? This is a 4 speed motor that is in it. However only 2 speeds are actually hooked up. Could a 2 or 3 speed be used instead? Also, it is a 1/3hp 5.8fla psc, can I use a 1/3hp 6.1 or 6.2, or even a 1/2hp 6.1 or 6.2? I don't want to spend the $250 for the exact replacement because I would be better off buying a new furnace. This furnace is about 25 years old from my diagnoses and investigation. I have replaced the spark control, the pilot and the inducer motor in the last 3 years. But if I keep replacing parts like this then it might just warranty a complete replacement