I'm trying to install an older nest in my condo but it immediately complains that there's no common wire attached (error e24). I opened up the fan coil in my condo and there is no specific terminal for the common wire. Is there anywhere on this circuit that I can connect a c wire? Some people tell me that if I hook a wire to one of those transformer terminals that will give me 24v, but others have told me that it won't work.
Or would I be better off getting a 24vac adapter and connecting the wires to C and Rc? (with the R wire from the fan coil unit going to Rh). This seems like a common fix on youtube for people lacking a common wire. I'd prefer though if I can just attach a wire somewhere in the fan coil system though. Thanks!