Completely unwired both zone boards and thermostats stripped wires to proper size and rewired thermostats, zone boards, dampers and equipment low voltage. Once system was completely wired up, tested Dampers, Ducts, Heat and A/C. System operated properly through all test. Checked refrigerant pressures, pressures and temperatures are appropriate for indoor and outdoor weather conditions. Programmed thermostat and set schedule to 75 cool, 70 Heat. Replaced 16x25x1 filter. System is operating properly and is no longer giving communication fault code. Homeowner was not home when leaving, locked back and front door.