Furnace running

[clevecigr]

I reently purchased a house with a York Diamond 90 furnace and a two zone (4 damper) EWC BMPlus 2000 unit. As we are now in between seasons, I no longer have the AC running, nor do I have the heat on, however, it seems that the furnace is running occasionally anyway. Any idea why?

[Eric K.]

What mode of operation are your thermostats set for?