Motor will not
start up (humms):
There were 2 types of motors used. I suspect
your heater has a starter relay. The solid state relay was used to
allow the energizing of the start winding which would allow the
motor to achieve approx 80% of rated speed, then the relay would
de-energize the start winding to prevent overheating. There is no
attachment between the motor and the relay, except for the wiring.
This is what the starter relay looks like. If
your heater has one, check to see if it is energizing the starter
windings at start-up. If not it is probably defective. The part is
still available at
http://www.reddyparts.com/, I think, but today's replacement
part looks slightly different.
If your motor does not have the relay, then the
motor has an internal start-up system, which is not serviceable, but
the motor is probably still available.
The motor usually has the part number printed
on it, but the number on the label may not be the current part
does your heater have?