Dual fuel geo split 5 series 4 ton water furnace Lennox natural gas 2 stage 96% Installing contractor used Lennox evaporator coil as the air coil Geo is low on refrigerant and already has leak sealant in the system Gas furnace was throwing a slew of pressure switch codes Found furnace burner intake pipe full of foliage Cut pipe and cleared blockage. Put intake back together with an unglued coupling for future cleanout Gas furnace operating properly now Removed cover for Lennox coil. No obvious signs of a leak. From experience, the likelihood of the Lennox coil leaking refrigerant is very high. Recommend replacing coil with a water furnace coil 21" wide coil. If taller than 29", reme halo will need removed and humidifier bypass relocated to the side of the plenum.
