Came back to do repairs and enhancements, added a new transformer, cleaned evaporator coils, added 2 damper to upstairs unit, install 2 ApcoX, replace old condensate line for downstairs system and reset system. Unit was working properly for a while. Right before I left homeowners house I notice that thermostat was showing an error code, so checked system again and after my finding a notice that smart hub and zoning system suddenly failed. Smart hub is discontinued so needed to upgrade Lennox thermostat that doesn’t required smart hub and replace the zone board. Costumer parts are under warranty so drove to Lennox facility to get the new parts and move forward with repairs. Tested system for a long period of time to make sure nothing else came up and system is now working properly. Thank for for choosing TE Certified!