Williams P323080 Fan Switch 321894-708 Inspect the connection to the

Inspect the connection to the Q3400A igniter-flame rod

While the valve body itself can often be converted

Built with a robust Open Drip-Proof (ODP) enclosure and a 6-pole configuration

Variable Speed Control: Maintains steady airflow across varying static pressures for better comfort

preventing ground-out issues common with aftermarket variants

Williams P323080 Fan Switch 321894-708 Inspect the connection to theThe Williams P323080 Fan Switch is a critical OEM replacement part engineered for precise thermal control in Williams Monterey furnaces and direct vent gas heaters. This furnace fan limit switch functions as a normally open, temperature actuated control, ensuring the blower motor engages only when the heat exchanger reaches the appropriate operating temperature. This prevents the circulation of cold air during the heat up cycle and protects the system