I am having a similar problem. Thermostat and App are bright orange indicating furnace is on, but it is not. Happens often in the morning. We have it set at 64 degrees over night and programmed to 69 degrees at 5:30 am. We wake up to a very cold house and it is obvious the furnace has not run. If I turn the thermostat to Off for a minute or 2 and back on, the furnace runs about 5 minutes later. Is this a problem with the Nest or the furnace?
I have same problem. Neat shows furnace is running but it is not. Is there some setting that is confusing the system? I turned the furnace breaker off and then on. Now seems to be working. Any idea what is causing this? I am honestly thinking of going to a Honeywell setup- they at least have a deeper history on running such a basis function of setting a temperature and the furnace just follows along. My finance is newer as well and should not conflict. Too much software on these fancy products nowadays and programmers are getting sloppy.