if your current unit specifies part 1177609 or is a 3/4 HP variable speed motor with a 1/2" shaft and CCW rotation

What causes this igniter/flame rod to fail

While surface carbon can be brushed off

When you are troubleshooting a furnace pressure switch

Williams 6912 Combustion Chamber Kit 318973-401 if your current unit specifiesThe Williams 6912 Combustion Chamber Kit is a critical replacement assembly designed for Williams Monterey top vent wall furnaces. This kit restores the integrity of the heat exchange process, ensuring safe venting of flue gases and optimal thermal transfer. Engineered for high temperature durability, the 6912 combustion chamber addresses common failure points such as stress cracks or burn through in aged wall furnace heat exchangers. As a direct OEM