The following can cause this problem..................
1. Bad blower motor.
2. Bad blower motor wheel.
3. Trash in the blower housing...
You need the owners or installers manual, jumper lead wire set - not car battery jumpers -- electricians meter, spare parts. All the above and more depends whether you have a milivolt or electronic controlled gas heater.
A motor does not provide energy. It converts electrical energy to mechanical energy. From a circuit standpoint, the motor is considered a load (similar to a resistor). Resistors convert electrical energy to heat energy.
It doesn't matter which way the blower motor turns, it is the angle of the blades that matters.
A ceiling fan that mounts directly to the ceiling with no down-rod.
Behind the battery. You need to take out the battery, and the battery tray, then it's easy to access. Keep in mind that the resistor may have burned out because the blower motor is failing.
Start by diagnosing to identify the problem. Have the relays and fuses been checked? Is there power going to the blower motor? If so, does it go to the blower motor on all settings, or just on the high setting? If that's the case, it's the resistor you need to replace. If there's no power going to it, you need to see if power is going to the blower switch, and if you have continuity at the switch. If everything checks out, and the blower motor doesn't respond when power is applied to it, you need to power and ground it from a separate source and try applying power again. If it works at this point, you have a bad ground, and need to repair it. If it doesn't, then the blower motor is bad, and needs to be replaced.