Arrived for no cool issue. Talked to homeowner and found theretsat was issue with tstat. Checked tstat and found tstat not accurate. Tstat reading 69 room temp. Actual room temp 72. Tstat is communicating tstat. This is a communications system and I gave the homeowner a option of replacing the communication thermostat or replacing the board with the thermostat. We will have to order both or one or the other part. We decided to remove the batteries out of the thermostat and let it run soley on the communication and powerful of the furnace. We preformed a test and verify at this time and we are going to let the system run as is for now.