Upon arrival customer stated recently replaced thermostat is blank and other two thermostats are not cutting system on and Wi-Fi disconnects. Tech disabled Wi-Fi feature on these thermostats and tested both systems, both systems came on and ran properly. Blank thermostat has 0v, tech was unable to go on rooftop to further diagnose due to weather. Will have to call and schedule a time for us to come back out and further diagnose system.