surburban furnace will not light
sf -35 # 963105899 in 97 allegro bus. Furnace goes thru steps but does not light. I have 12 volts to relay, temp sensor, sail switch , to circuit board. Fan runs ,But I do not smell propane out exhua...
Forum Discussion
YES......
Brown wire from board goes to gas valve....12V DC(+)
Yellow is common ground 12V DC(-)
Red wire is 12V DC(+) from battery for fan motor and from limit switch (t-stat to sail switch to limit switch)
The heavy gauge wire (Orange...may look red if faded) is the high tension wire going to spark electrode. Sends high voltage from board to spark electrode and then is used for milivolt signal back to board to prove main flame.
Brown wire from board goes to gas valve....12V DC(+)
Yellow is common ground 12V DC(-)
Red wire is 12V DC(+) from battery for fan motor and from limit switch (t-stat to sail switch to limit switch)
The heavy gauge wire (Orange...may look red if faded) is the high tension wire going to spark electrode. Sends high voltage from board to spark electrode and then is used for milivolt signal back to board to prove main flame.
