York S1-025-29041-003 Limit Switch

The York S1-025-29041-003 Limit Switch is a critical OEM safety component engineered for precise thermal regulation within residential gas furnaces and HVAC systems. Designed with an auto-reset function, this high limit control provides essential overheat protection by monitoring the internal plenum temperature. This specific L165-30 furnace limit switch is calibrated to open at 165°F (shuting down the burner) and close at 135°F (resuming operation once temperatures stabilize), effectively preventing heat exchanger damage and system failure.

For service technicians, the Source1 S1-025-29041-003 is the exact 165/135 degree replacement for many York, Coleman, and Luxaire units, including variable speed PV9 2-stage downflow and horizontal models. Utilizing a 3-inch insertion probe, this furnace fan limit switch ensures accurate sensing and reliable switching in high-cycle environments. Replacing a sticking or failed HVAC high limit switch corrects common field issues such as short cycling, continuous blower operation, or the unit failing to ignite due to a permanent open circuit.

• OEM Compatibility: Genuine Source1 part designed as a direct drop-in for York S1-025-29041-003, ensuring factory-spec performance.
• Thermal Safety: Precision 165 degree open / 135 degree close settings protect the primary heat exchanger from warping or cracking.
• Automatic Reset: Eliminates the need for manual intervention after temporary temperature spikes, maintaining consistent uptime.
• Durable Construction: Engineered to withstand the rigors of high-temperature furnace plenums in residential heating applications.
• Easy Integration: Standard two-wire terminal configuration with a 3" probe depth for rapid field installation.

How do I know if this limit switch has failed?
Technicians typically check for a "Limit Switch Open" fault code. Physical symptoms include the indoor blower running constantly while the burner remains off, or the furnace short cycling—shutting down shortly after ignition before reaching the thermostat setpoint.

What causes this switch to trip frequently?
Frequent tripping is often a symptom of restricted airflow. Check for a clogged air filter, dirty evaporator coil, or a failing blower motor before replacing the limit control switch.

Is this compatible with multiple brands?
Yes, as a Source1 part, it is the primary replacement for various York, Coleman, Luxaire, and Evcon furnace models. Always verify the L-rating and probe length against the existing part.

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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.