Try to exclude and re-pair your thermostat. You may try to reset your thermostat with reset button as explained on this topic also which could repair a broken connection: [RELEASE] Enhanced Z-Wave Thermostat Device Handler with Z-Wave Plus
Try to exclude and re-pair your thermostat. You may try to reset your thermostat with reset button as explained on this topic also which could repair a broken connection: [RELEASE] Enhanced Z-Wave Thermostat Device Handler with Z-Wave Plus