Williams P321942 Limit Switch

The Williams P321942 Limit Switch is a critical OEM safety component engineered for Williams Forsaire Direct Vent Wall Furnaces and 6007 Series counterflow units. This temperature-sensitive switch, classified as an L210-40F limit switch, monitors plenum air temperature to prevent heat exchanger damage and hazardous overheating conditions. As a technical HVAC replacement part, it is designed with a normally closed contact configuration that opens the circuit when internal temperatures reach 210°F. Once the system cools to 40°F, the switch automatically resets, allowing the heating cycle to resume.

For contractors and technicians, ensuring Williams furnace compatibility is vital to maintaining system integrity. A malfunctioning high-limit device is often the root cause of short-cycling or blower motors running continuously without heat. This genuine furnace safety switch provides precise thermal response times, ensuring the flame is cut immediately if airflow is restricted. Utilizing genuine Williams Comfort Products parts guarantees the exact mounting specifications and electrical ratings required for safe, code-compliant equipment operation in residential and light industrial applications.

• Precise Thermal Limits: Opens at 210°F and automatically resets at 40°F to ensure high-limit safety.
• OEM Compatibility: Specifically designed for Williams Forsaire Direct Vent 6007 series furnaces for exact fitment.
• Safety Compliance: Prevents heat exchanger warping and hazardous conditions by interrupting the gas valve circuit.
• Rugged Construction: Built to withstand the harsh thermal cycles of industrial and residential heating environments.

• What does an L210-40F rating actually mean? The 'L' stands for Limit. 210 is the opening temperature (when the switch trips), and 40 is the temperature differential for the reset.
• Why is my furnace blower running but I have no heat? A tripped or faulty high limit switch is a common culprit; it triggers the fan to cool the unit while cutting power to the burners.
• Can I bypass this switch for testing? Never bypass a safety limit during normal operation. If the switch is open at room temperature, it has failed and requires immediate replacement.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.