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billvann · 11-25-2023

Installing to replace honeywell thermostat th5220d1029. Red wire = R on Honeywell (jumper between R & Rc) = Rh on NestBlue wire = C on Honeywell = C on NestOrange wire = W on Honeywell = W1 on NestYellow wire = Y on Honeywell = Y1 on NestGreen wire =...

billvann · 12-28-2023

My bad. It turns out I do have a heat pump. The wiring on the original thermostat tricked me as the bottom row was not used. Perhaps there's a connection between the top row and bottom row. Anyway, thanks for your advice and especially your patience.

billvann · 12-04-2023

It's a standard furnace, not a heat pump. None of the heat pump connections on the Honeywell are used. I think the original contractor used the orange instead of white for some reason as the white was not connected to anything.

billvann · 12-01-2023

Here's the current wiring. I have also uploaded a Honeywell web image of the block with the lettering so it's clearer. Note that the wiring in the web diagram is not the same as mine as I do not have two leads in Y2 and W2, mine has a jumper. I didn'...

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3rd Gen thermostat replacing Honeywell runs both heat and A/C at same time on cool

Re: 3rd Gen thermostat replacing Honeywell runs both heat and A/C at same time on cool

Re: 3rd Gen thermostat replacing Honeywell runs both heat and A/C at same time on cool

Re: 3rd Gen thermostat replacing Honeywell runs both heat and A/C at same time on cool