in ECO setting, house heated to 108 degrees

[champlinites]

St George UT is location

We were out of town for 6 days last week.  The thermostat was set to ECO, 65° to 78°F. A day after we left, house guests arrived in the afternoon and advised us the house inside was over 100°F.  The history of the HVAC for Monday/Tuesday is shown below.  No evidence in history of anything wonky, but Tuesday late afternoon I remotely turned on AC to cool house down from 108 to 75F.  

The day before we left the furnace was on for 1.75 hours.  Monday it was on for 9.75 hours (outside temp was in the 50s-60s, maybe thirty to forty degrees at night). Tuesday the furnace was on for 16 hours, then I turned the AC on for about 4 to cool it down.

Is there a glitch in this thermostat?  The history shows no settings for anything higher than 71°.

HELP!  This is not supposed to happen!

[champlinites]

SOLVED?  I have 2 remote temperature sensors, one in the office, one in a garage freezer (which had a new compressor installed earlier this year).  While traveling I may have brought up the readings of the three and inadvertently selected the freezer sensor as the one used by the HVAC system.  Thus the furnace was trying to heat up to 71 degrees an area that was not being sensed.  No wonder it ran for many hours trying to match the freezer sensor setting of 71.  A lesson learned...