Williams P296001 Limit Switch

The Williams P296001 Limit Switch is a critical safety component designed for Williams Forsaire Top Vent (5008 Series) and Direct Vent (5507 Series) wall furnaces. This L175-35F limit switch serves as a high-limit safety control, engineered to break the electrical circuit to the burner or blower if internal temperatures exceed the 175°F safety threshold. Functioning with a normally closed (NC) contact configuration, it features an auto-reset mechanism that restores continuity once the system cools to 35°F below the trip point. This protects the heat exchanger from thermal stress and potential failure. As the direct replacement for P200300, this OEM Williams furnace part ensures drop-in compatibility and factory-spec calibration. For technicians troubleshooting furnace short cycling or blower motor run-on issues, verifying continuity across the terminals is a standard diagnostic step. This bimetal temperature control is essential for maintaining the operational integrity and safety of residential gas wall heaters.

• Direct OEM Replacement: Replaces legacy part number P200300 with exact physical and thermal specifications.
• Auto-Reset Safety: Features an L175-35F rating, automatically resetting after a high-temperature trip to restore system operation.
• Application Specific: Optimized for Williams Forsaire 5008 and 5507 series furnace cabinets.
• High-Limit Protection: Prevents overheating by monitoring plenum temperatures and interrupting the burner circuit if airflow is restricted.
• Durable Construction: Built to withstand the harsh thermal cycles of a gas furnace burner assembly.

What causes a limit switch to trip repeatedly?
Repeated tripping of the P296001 is usually a symptom of restricted airflow. Technicians should inspect for clogged air filters, blocked return air grilles, or a failing blower motor that isn't moving enough air across the heat exchanger.

Is the Williams P296001 a manual or automatic reset?
The P296001 is an automatic reset limit switch. It will open at 175°F and close once the temperature drops by the 35°F differential, whereas manual reset switches require a physical button press to restore power.

How do I test the P296001 for failure?
Using a multimeter set to continuity, check the terminals while the switch is cool. A functioning switch should show a closed circuit (continuity). If the circuit remains open at room temperature, the switch is defective and requires replacement.

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.