I had a Nest E installed in February and it has worked really well until it was time to turn on the AC. Now I get random e195 errors (no power detected to the R wire).
The most likely answer from my research is that I need a c wire installed. A friend of mine who's an electrician installed one from the furnace to the Nest. But we are left wondering where to connect the c wire on the furnace. We tried in the "B" terminal but that didn't work.
Would anyone be able to help from the schematics attached?