Hi all,
Moved into an apartment and I wanted to swap out the old dumb thermostat for a nest thermostat. Below photo is the old thermostat. It had 5 wires labeled G, RC, Y, W and 4. When I go the nest site to check if its compatible, it says it's not because of the '4' wire. I decided to just try hooking it up anyhow and ignoring the 4 wire. And as far as I can tell everything is working. Heat/AC both will turn on. I can turn on just the fan with no heat or A/C.
But just because it seems to work I figured I should ask here first before I actually start using the nest thermostat. Can someone tell me what that 4th wire was supposed to do? Is it a dud if everything seems to work without it? Let me know if you need additional info.
Thank you
Moved into an apartment and I wanted to swap out the old dumb thermostat for a nest thermostat. Below photo is the old thermostat. It had 5 wires labeled G, RC, Y, W and 4. When I go the nest site to check if its compatible, it says it's not because of the '4' wire. I decided to just try hooking it up anyhow and ignoring the 4 wire. And as far as I can tell everything is working. Heat/AC both will turn on. I can turn on just the fan with no heat or A/C.
But just because it seems to work I figured I should ask here first before I actually start using the nest thermostat. Can someone tell me what that 4th wire was supposed to do? Is it a dud if everything seems to work without it? Let me know if you need additional info.
Thank you
