My HVAC Tech told me the nest will not work without the common wire to
get enough power. So the nest will not work on only the white wire and
red wire. And I also found this online “Back in the olden days,
thermostats were simple on/off devices that ...
Is it safe to have wires set that way? Because I had same issue so I
removed the red wire from Rc and placed it back in to fix the issue. But
now testing to turn on heat and I get t04 error. I’m thinking I will try
to what you did. White to Y1 and Re...
