Seems to me if, the unit is ONLY 2 weeks old, I'd ask the installing contractor.
But that's just me, asking people here who have no clue as to your installation is like asking 'my car won't start, what's wrong with it?'.
Nobody here knows the static pressure of your ducting system, nor the delta T of your system to even start to give you an educated guess.
Is there some reason you didn't ask the installing contractor?