Sensi themostat C wire


Old 01-14-20, 04:57 AM
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Sensi themostat C wire

Hi, I am trying to hook up a SENSI WIFI thermostat. My existing thermostat does not have C wire connected but there is an extra wire in wall (see attached photo). down at boiler the wiring is different any ideas on how to connect C wire? Photo of TACO attached.

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Last edited by PJmax; 01-14-20 at 09:11 PM. Reason: resized pictures
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Old 01-14-20, 09:07 PM
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Welcome to the forums.

Is that Sensi going to control one zone of heat only ?
I see a G and Y connection but not where those are at the controller.
Those connections indicate A/C and if so...... that's where the C must come from.
That thermostat should have an Rc and an Rh wire.

The cable that is at the thermostat is not the same cable as seen at the zone controller. The blue wires are different shade. There will be a splice you'll need to find.

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