Red & C are the power. You only need 3 wires for that stat. What model is the
thermostat? I have three TH6220WF units here. If you have a base on the wall
that has a slide switch on it for connecting the R & Rc, it canâ??t hurt to
have them connected but it is probably the problem.
Measure the voltage on the thermostat base in the holes the pins go into. There
be a bad connection in the base.
Peace,
Pat
Pat Horne
We support Habitat for Humanity
On Feb 2, 2021, at 9:47 AM, Rochlin Robert <rrochlin@comcast.net> wrote:
Hi Pat,
Thanks for the quick reply. I did jump the red and white at the thermostat
and the heat does activate, Iâ??m also getting power to the C wire when I
ground it at the thermostat. Iâ??m figuring that the lack one of the other
wires, A/C or fan, may have something to do with the unit not working. If the C
wire is common shouldnâ??t there be another wire to complete the circuit to
provide power to the unit, maybe the red?
Best,
Bob
> On Feb 2, 2021, at 10:32 AM, Pat Horne <patintexas@icloud.com> wrote:
>
> There should be 24V AC between the C & R terminals. A wire may have broken
> while relocating.
>
> You can check the white & red by shorting them together. If it works the
> problem is with the C wire. If not, itâ??s probably the R wire.
>
> Peace,
> Pat
>
> Pat Horne
> We support Habitat for Humanity
>
>
> On Feb 2, 2021, at 9:26 AM, Rochlin Robert <rrochlin@comcast.net> wrote:
>
>  I moved my Honeywell WiFi thermostat from the 1st floor where it
> controlled A/C, heat, and fan to the garage where it would only control heat.
> I wired a C wire and connected the red and white wires from the appropriate
> boiler zone to the WiFi thermostat but I does seem to be getting power. Aside
> from not having a fan or A/C wire the installation is the same. I know the C
> wire is a good circuit because it is the same one that this thermostat used,
> and a new now functioning first floor thermostat uses. Any help appreciated.
> Best,
> Bob
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