My home inspector has reffered me to this site.
I recently purchased a home and have noticed potential furnace problems after the move in. When the temperature is set at for 70 degress, the furnace seems to run for about 8 minutes, then shuts down for 2 minutes, and then restarts for 8 minutes. If I decrease the temperature the amount of time the furnace is off increases and the time the furnace is on decreases for during the cycle. It seems to be running fine, but the shut down and start up does not appear to be normal. I can imagine it being major since the furnace is about 4 years old. It is a Lenox G40DF.
Any information you can provide would be much appreciated, especially during this cold time of year!