Cooling AC system repair Found that thermostat wire from thermostat to air handler Loss of communication. Common wire to thermostat was barely in the wire not connected to the other common wires. Picked another pair of thermostat wires from Air handler to thermostat. Remove thermostat wire that was zip tied to the high-voltage lines. This is bad on communication wire will induce a voltage Causing bad communication . Unit is operational and cooling at this time