Wasn’t here to look at issues with the thermostat and zone board. The system was turning on the backup heat right away in heat mode. I found the thermostats were not wir d correctly. Fix thermostat wiring. Also w not through the thermostat programming and zone board set up switches. Both were set up wrong. I fixed all the settings. Cycled the system through heat, cool, and emergency heat mode and the system is operating properly now.