How To Wire My Thermostat December 31, 2018 Wiring . diy.stackexchange.comHeat only 2. This article applies to the ecobee3, ecobee3 lite, and ecobee4 ecobee thermostats require a C (common) wire to power on. If you only... support.ecobee.com 12v Ice Cube RelayHunter Fan Blue WireNo Ground Wire In Light Switch BoxHow Do You Install A 3 Way Light Switch12 Romex WireHow To Connect C Wire To FurnaceInstalling Ceiling Fan With LightSquare D Combination Starter Wiring Diagram