https://support.ecobee.com/s/articles/My-ecobee-thermostat-won-t-turn-on-How-can-I-troubleshoot
Most likely the power source to thermostats is dead.
https://support.ecobee.com/s/articles/My-ecobee-thermostat-won-t-turn-on-How-can-I-troubleshoot
Most likely the power source to thermostats is dead.