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I'm having an issue with my newly installed Ecobee3 thermostat with a 4 wire/PEK configuration (R to RC; G to G; Y to Y1; W to W1). We keep our home at 67 degrees at night. In the morning, when the "Home" Comfort Setting starts at 6:00A, we have it set to warm the home to 72 degrees. When the unit first turns on the heater, the fan starts a few seconds later as expected. However, after a few minutes (maybe 15 or so) the heater stops at 68 degrees and the fan stays on (which is also odd as I have to set to turn off when the heater stops). We can't seem to get the house above 68 degrees. If you look at the thermostat, the flame icon is lit up so it seems the unit thinks its still heating which is why I think the fan stays on as well. But it's clear to me that the furnace heater has turned off based on observing the sound of the heater, the non-heated air from the vent, and the fact that the house temp doesn't go over 68 degrees.
If I power off the furnace (which powers down the Ecobee) and turn it back on, all of what I described above is repeated. I've done this process a few times now and it's consistent. If I do this process 2-3 times, I can get the house to 70 degrees and the house seems to maintain that temp pretty well. But I think this is more of the house retaining heat, rather than the Ecobee functioning as it should.