Ya' really need the schematic and theory of operation; for me it was free from Bryant, but mine uses only relay logic.
This documentation might be online somewhere for your furnace.
There are several sensors ANDed together that can prevent the furnace from starting, and their signals can valid or invalid.
"The controls include the gas valve, ignition control, ignitor, flame sensor, transformer, limit control, blower control board, and flame roll out switch."
This documentation might be online somewhere for your furnace.
There are several sensors ANDed together that can prevent the furnace from starting, and their signals can valid or invalid.
"The controls include the gas valve, ignition control, ignitor, flame sensor, transformer, limit control, blower control board, and flame roll out switch."