Hi this has been an occasional problem but now it is to the point that the furnace wont keep burning.
When switched on it lights normally. They about 3 seconds later it cuts out. I'm sure its a sensor. How can we figure out which one is signaling a problem?
Also what might the problem be? I mean could it be a bad sensor or does it mean something major? It has been running very strong. I think it may have to do with condensation.
Today I discovered that the flame at ignition is not getting all the way across to the last burner. The ingition sensor is at the last burner. Since it does not detect flame it shuts down the system. Any one know why this might be happening? Could it be having problem drawing air. Could the elements be bad?