Williams P321826 Limit Switch the plunger is responsible for

the plunger is responsible for the precise mechanical travel that balances hot and cold water streams

which is essential for maintaining system efficiency and protecting your pneumatic actuator from overshoot

or diagnostic LED codes indicating a "switch stuck open" error

System Protection: Prevents burner operation during inducer motor failure or flue blockage

Built for high-cycle reliability

Williams P321826 Limit Switch the plunger is responsible forThe Williams P321826 Limit Switch is a critical safety component designed specifically for Monterey Counterflow Top Vent Furnaces, including the 250, 350, and 500 series. As a veteran technician knows, maintaining the integrity of the vent safety shutoff system is non negotiable for preventing flue gas spillage and potential carbon monoxide hazards. This replacement vent limit switch is engineered to monitor exhaust temperatures and will break the