“I have three zones in my house controlled by three separate thermostats. The main thermostat has a C wire the other two are battery-powered can this be tied together to replace those thermostats”
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Chances are the other 2 thermostats also have unused C wire in the wall. If you have a unused C wire in the wall, ensure they are connected to C wire in the main zone controller by the side of the HVAC. In the attached picture of my Zone Controller, only one of the C wire was connected. For other 2 Zones, the blue C-wire was unused and wrapped around the wires. I connected the unused C-wire to the C-port in the box (which provide 24V) and was able to use the Thermostat. Similarly at the thermostat end, the C wire may be wrapped around wires (easy to miss) or is inside the wall and need to be pulled out.
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