I have a heat pump split system. My outdoor unit is turning on. However even in the "fan on" position on my thermostat no air is beign blown out the vents. My air handler is above my garage.

If I turn the thermostat off and back on the lights dim a little in the room like they normally did when it was working for a slit second, but no air is coming out.

This system is for a bonus room that is small and only about 4 years old.

Could it be the relay in the air handler and exactly where would that be?

I appreciate your help!

It could be a relay, a capacitor, or worse case senario the blower motor itself