I have a heil furnace in a home I just purchased. The first day it worked fine. Second day, it fires up, I can hear a motor running, but the blower doesn't come on. Relay switch?
Thank You!

What motor o you hear running? Is you heater a belt driven blower or is it a direct drive. If you have a belt drive system it could be a belt off or broken.
You need more info before you are going to get much help so re-post and tell us what is going on in your furnace.

Did you have a home inspection? I really think if a problem develops that soon the seller is responcible.