I pressurized the ground loop to 65psi. I vacuumed the EAC pre filters and reset the led panels. I checked the electrical wiring and electrical systems, including auxiliary heat strips, all are within specification except for the voltage absorption system for unit #1, which was replaced. I operated the units on second stage heating mode and recorded 25+ degrees delta temperatures across the air coil and normal heat of extraction. Both units are operating normal. Aprilaire #35 Water Panel