hvactechfw's Avatar

Join Date: Jan 2011
Posts: 6,245

01-22-12, 06:08 PM   #6 (permalink)  
DO you have a millivolt system? That is the first thing you need to be sure of. I also do not understand how Nest said that your system would work when you need at least 3 wires to the thermostat for it to operate (you said you need to connect C) so you would need wires on Rh, W, and C. do you have the ability to run 3 wires to the stat? Do you have an extra wire in the loom already there and not being used?