Furnace will heat up to set temp, but will then drop 10-20 degrees below the set temp before it kicks in again.. It is a digital thermostat
labman
Apr 10, 2007, 08:35 PM
One sure way is to remove the red and white wires and connect them. If the furnace begins a cycle, it is the thermostat. Poke through the directions for anything about the temperature differential.