We have a Lennox G 2003/4E-100-3 Furnace. The problem we are having is that the pilot lights, the burners light, the blower comes on just like normal. But after a few minutes of running, the burners starts cutting in and out repeatedly.
May want to call an experienced Lennox tech. The heat exchanger may be cracked and opening up after it heats up. Not an easy furnace to troubleshoot if you don't have LOTS of experience with them. Not something I can walk you thru over the net.
"Cut it twice and it is still too short".
The Following User Says Thank You to yuri For This Useful Post: