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What is Nest support saying you need to do?
Where are you having problems with the wiring?
Tell me exactly how you have it wired, please.
I understand. But I need to know exactly how you have it wired.
The y1 and w 1 sound right as well as the red to R-RH. You need a common. The way to do this is to take the green wire and move it to C or COM at both the board and the thermostat.
green wire needs to be moved to C or common at both stat and furnace board.
I understand. So have you moved green wire to C at stat and C or COM at furnace board?
OK, tell me what is the make and full model number of furnace? Also, if you can upload some pics, that would be helpful. There is a $28 charge for this question, just so you know.
Possibly. But first can you get me the information I asked for?
The $28 is the standard charge for your question. If you wanted a phone call that would be additional.
I show this as what your board should look like:
So not understanding why you are having trouble moving the green wire? The terminals are clearly labeled on the board. Perhaps I am not understaning something?
Did you have a communicating thermostat before?
OK, take the thermostat wires off the ABCD terminal and transfer red to R terminal, white to W1, yellow to Y1, and green wire to C or COM at board and C at stat
The problem is you are going from a communicating thermostat setup to a standard thermostat setup. So that's why it's not working
Post back after everything is done and let me know the results.
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