Upon arrival customer stated the thermostat was following a schedule despite them never programming one. Went through the settings and could not find the setting for turning the schedule off even after resetting the thermostat. After talking with the customer we found they typically leave the house at a constant temp and don’t often change the temp set point . Went into the schedule and set all set points at 72 so the thermostat will always keep the house at a consistent temp. If the thermostat has any other issues it will need to be replaced. Told customer to call within a month is any issues arise or they still want a new thermostat. When attempting to go in with the paperwork we found the thermostat had adjusted itself and set the set point to 83 without anyone touching it. Physically watched the thermostat set point going from 83 to 72 and back showing the thermostat is definitely malfunctioning. After getting customer authorization we replaced the thermostat with a new one. Turned