E80 error code

[Fost0159]

Hi, we bought the nest learning thermostat and are having wiring issues. We only have a furnace and no AC. When we connect all the wires we get a message saying no power to y1 wire and it will not work. We tried to cap the wire to bypass it but it still won’t kick on our furnace. 

[David_K]

There's a good article that explains why this happens and what you can do to fix:

Troubleshoot E10, E30, E66, E80, E116, E160, E196, E296, M13, N254, and N262 help codes - Google Nes...

[Fost0159]

We tried that and if we take the Y1 wire out the furnace will not kick on. 

[Geo86]

Im having the same issue any suggestions?

[Fost0159]

We still don’t have ours working… we had to re plug in our old thermostat. We have no idea how to fix the error code and nothing we’ve found online has worked.