Stupid question... but are you putting the filter in the correct way? They have a definite airflow direction, and if you get it backwards, it can really impede airflow. Also, are your airflow settings on the controller in the factory default mode? They are usually a set of dip switches. If they weren't properly configured by taking static pressure measurements of your system, it might have the improper ramp-up settings that would cause it to trip. So if your furnace guy just came out and installed it without doing any measurements, then it might not be properly tuned for your duct flow.