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Hi I'm Brian and I'm here to help!
Can you please send me the make and model number of your furnace?
Thank you for that. Please allow me a few moments to pull up the manual and we'll go from there.
Thanks for that info. I'm locating the manual now and I'll be able to tell you much more about your blower.
Ok, phew that took longer than I expected! Your unit has what is called an X13 ECM (Electronically Commutated Motor) which is a variable speed motor. It does not have the standard run capacitor like older motors did. It does have some capacitors in the electronic speed drive end of the motor but they are not user serviceable, they are part of the electronics of the speed control.
With all that said, if you have a volt meter, knowledge of its use and are comfortable probing points hot inside the unit on the control board, we can do some simple probing and determine whether it's your thermostat, control board or the motor itself that's the problem.
Let me know how you want to proceed and I'll help anyway I can!
Click Here for a link to all the documentation for your unit. If the control board has failed it will need replaced. The X13 motor is a little simpler to diagnose than a full blown variable speed motor. The control board simply sends 24Vac signals to one of the five speed terminals on the motor then there is a 24Vac common to the motor. If the board is not sending the 24 volt signal when it should be, it is defective. If the control board is sending the 24volt signal and the motor has high voltage to it (as it should at all times), the motor is defective and will need replaced.
Let me know if you have further questions on this subject. Otherwise, please remember to rate before leaving (3 stars or higher please!). Bonuses are always appreciated! Thanks for allowing me to help and thanks for using Just Answer!