I have a 5 wire system Y1, G, Rc, W1, Rh
Dual transformers. Central forced air and gas base board
i installed the gen 3 nest thermostat on one of the 3 zones of heat the furnace would power on for 5 minutes, quickly shut off, then turn back on. I added a C wire from the AC unit. Same issue
i then removed all AC wires (Y1, G, Rc, C) from the nest and just kept W1 and Rh, no short cycling. I then reattached all wires. Short cycling again. I tested just removing Rh and keeping all other wires (Y1, G, Rc, C, W1), no short cycling
I don’t really understand what the issue is.
My question is do I have to use the Rh wire at all? Can I keep the Rh wire disconnected from the nest at all times? Could the C and Rc from the AC ever damage the furnace motherboard or anything like that? Is there another solution?