Curret Thermostat only has 2 wires

[Brandbird]

Hi Sewey99

You may want to take a look at this thread that I started earlier today, I’m not sure it’s the same issue but it may be worth seeing. I’m going to try the solution tomorrow. I’ll report back.

Thermostat R and W only but furnace has CYGRW

And here’s the original thermostat: [Monosnap 2020-12-29 19-04-22]