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Hi guys, I am new here. I had an Ecobee3 with 3 external sensors for about 2 months now. Works great, love it. Yesterday my family was out and when they returned they found the furnace fan running but no heat. that was OK, it was not cold in the house. Still the fan was ON for a long time.
I checked the logs and indeed the fan was ON for about 2 hours, and during this time the temperature didn't drop below set point to trigger the heat. Here is the temperature and humidity charts. What could explain this?