Performed 1 system heating diagnostics on a 2013 Goodman communicating system. Issues: The board and comfort net thermostat are bad and randomly freezing up. I reset the system and it ran temporarily. The board and thermostat need to be replaced. Other issues: The system is short on supply duct work and return duct work. The transition for the return is undersized. The flue pipe reduces down to 3” and needs to be replaced with 4” (roofer will need to be called). The secondary drain pan is crushed against stud and is damaged. The from of the supply plenum is not insulated. The drain line has a long flat section with no slope. The outdoor unit has only 2 wires going to it and it needs 4 for proper communication. The outdoor unit needs an electrical disconnect box. The homeowner has setup a time with an install supervisor to look at replacing the upstairs system.