Nest cycles furnace on and off. Our oil tank ran out of oil. The tech started the furnace back jp again, and right away the nest started running the furnace for 15 minutes and then it shut down and would not start again for about 3 hours. The furnace then started again for 15 minutes and shut down again. The tech hooked up a regular thermostat (his 3rd visit same day) and the furnace is now running. So something happened co-incident with the out of oill situation.
