put a cap on the vent before the trap. Seal it with tape if you have nothing else and have the installer come and fix it.
you saw that too
cap that pipe at the top of the trap the "T" fitting, the pipe that goes upwards is open and thus causing your sondensate to not make it to the pump a 3/4 cap from a local hardware store will fix your troubles. although is the system is new, it would be fun to see how many times the contractor comes out to fix it