Whether you are performing a furnace relay replacement or troubleshooting a fan control board failure

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The switch is designed to break the electrical circuit when the sensed temperature rises to 105°F and will not reset (close the circuit) until the temperature reaches 165°F

The unit is hardwired and compatible with standard 24VAC systems

Williams P500118 Limit Switch 324846-701 Whether you are performing aThe Williams P500118 Limit Switch is a critical OEM high limit safety control engineered for precision temperature regulation in Williams Comfort Products heating systems. Rated at 300F, this auto reset limit switch acts as a primary fail safe, monitoring heat exchanger temperatures to prevent thermal overage and potential component failure. In a professional HVAC furnace repair context, utilizing an authentic Williams furnace part ensures the system