I checked the batteries on my White Rogers-9600 thermostat,which were fine.(earlier in the day-furnace ran fine) At 12pm the thermostat dropped to 62 degrees with no heat. After kicking up the heat to 70.It worked fine till 6am.When the thermostat showed 62 degrees again,and the house was cold.I hit the reset button. Now the heat is staying at 70 ,but for how long,as only time will tell. The thermostat wasn't programmed. Assuming the reset fixed the problem,why did l have the drop in temp w/o programming the thermostat?