My sister has a Heil Comfortmaker 10. If the furnace has been off for awhile the blower motor works fine, but sometimes when the furnane kicks on the motor will only hum and when not blow even turned to on. I spinned the wheel but it still won't start. It will just set there and hum. The motor has a capacitor hooked to it. Would it be the motor since turning it will not make it start or can the capacitor be bad? I don't think it is the relay becauses the motor hums. Any help would be greatly appreciated since she is on a very limited budget.