I bought two Ecobee Smart Thermostat Premium to replace our older Honeywell thermostats.
I checked both thermostats and their wiring matches and they do not have a C wire present. So I figured I’ll need to install the PEK to the HVAC control panel… …except, I go to the control panel inside and find that the control panel does have a C wire present.
I’m a bit confused since I don’t grasp why the control panel would have it when neither thermostats has it? Is there another panel somewhere I should be looking for like a zone panel?
https://preview.redd.it/2f62reb0zz1c1.jpeg?width=3024&format=pjpg&auto=webp&s=8b64260ea4d6e81345f3adf47f7f35d93d76ff2e