[dw9663]

I am also not a furnace expert by any means. Turns out the lockout module quit allowing continuity. You can take it apart and clean the terminals so it gets good contact. I am guessing that going through multiple flame out cycles that it tarnishes the terminals and then fails. Cycling the power should restore functionality, but in this case it did not, but cleaning it worked. That board is also not that cheap, so it saves some money to try to clean it up.

I was down to replacing either the lockout module board or the main board (mine has the relays and thanks on the tip of different wiring if I ever have to change it) and it turns out the initial failure appears to be the flame sensor. In this case, it is the flame sensor, ignitor and pilot nozzle all in one.

Does anybody know which direction (cw or ccw) increases the pilot gas flow? Right now adjusting it either way does not change anything, so I am thinking there is a restriction in the nozzle of the flame sensor unit. The pilot gas flow adjuster screw is located on the main gas valve.

Thanks