My furnace acts like it's going to kick on but the blower never starts up. The furnace is only about three years old and specifically for a mobile home. What could it be?

It could be the fan control or the blower motor itself.

More info,, by blower are you talking about the main blower that blows air through the ducts,or the inducer blower? Is it lighting,, are the burners burning?, Is it even Gas or is it electric