My furnace is not running properly. When it goes through the start up process, the gas valve opens and flames for a short period then I hear a clicking and notice puffs of air from the combustion chamber and the gas valve shuts down. This process repeats continuously. I checked for a flame sensor as described by the previous posting but there is no such rod with a wire attached positioned infront of the flame area.
I checked on the error code displayed and it was 3 amber flashes followed by 1 green flash. I am hoping to repair it myself and would appreciate some advice.
