Received a call that the furnace was not operating, upon arrival I found that the combustion lower was running but there was no flame. Upon further investigation, I found that as soon as the furnace attempted to call for heat and a signal was sent to the spark ignitor that the board would shut itself down and recycle. It did this several times, I removed the board and I replaced both the circuit board and the spark igniter. Installed both new items and cycled the furnace, was able to get the circuit board to spark a little bit longer but it would still shut down. I found that the coil in the gas valve was shorted which caused the initial failure of the circuit board, I replaced the gas valve with an OEM valve and cycle the furnace. The furnace is now running and operating properly.
