I have a Lennox furnace, cira 1972. Replaced thermal coupling. The pilot will light and the furnace will come on when I set the thermostat. Once the heat reaches the set temperature the furnace fan shuts off and the heat is reduced. Then the pilot goes out.
I replaced the thermal coupling and I understand that the tip should extend into the pilot light approximately 1/2 to 3/4 inches. It appears the it is only going in approximately 1/4 inches. I'm afraid that if I try to force it any further I might break either the gas valve or the flange that the coupling fits through. Help! I hate to call a repairman and pay out $200 plus for a repair.