With a cold stove. Confirm the correct location of both the baffle board and insulation board lying on top of the reburn tubes. If they have possibly been jostled forward during shipping/installation, they may restrict the venting. Maybe? Just looking at the manual it is worth a look.
Post a picture of the loading door opening also (door wide open) if you get a moment.
A slow starting load of 2x4's seems rather odd.
Post a picture of the loading door opening also (door wide open) if you get a moment.
A slow starting load of 2x4's seems rather odd.