I have just installed a new gen 3 nest thermostat and it cycles the fan on (100 sec) / off (1 sec) when the heat is off or above setpoint. My old thermostat was connected to W, G and R (jumpered to Rc). I have connected G, W1 and Rh on the nest and have tried G, W1 and Rc which returned a "no power" error.
the fan will run continuously when asked while in heat mode with the setpoint well below actual. I cannot shut the fan off without turning off the power to the furnace.
the nest appears to be working properly beyond the fan cycling issue.
I am running a gas furnace with logic that keeps the fan on for 100 seconds after the setpoint is reached and the burners shut off. there is no A/C but the unit was able to run the fan independently with the old controller.
Moderator edit: Subject updated for clarity and findability.
