York S1-025-26366-002 Limit Switch

The York S1-025-26366-002 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC systems. This OEM replacement part functions as a SPDT limit switch, featuring a specific temperature range of 120-180F. When the plenum temperature reaches the 180°F high-limit threshold, the switch opens the circuit to the gas valve or heating element, preventing the heat exporter from catastrophic failure. Once the system cools to 120°F, the automatic reset furnace switch engages, restoring normal operation without manual intervention.

For field technicians, compatibility is straightforward: this unit is a direct York furnace replacement part that maintains the factory specifications required for multi-position gas furnaces and modular air handlers. The snap-action design ensures rapid response to airflow disruptions or high-static conditions, protecting the heat exchanger from thermal stress. Whether you are troubleshooting a furnace limit switch tripping or performing preventative maintenance, utilizing genuine York HVAC parts like the S1-025-26366-002 ensures the internal safety string remains within manufacturer tolerances.

• Precise Thermal Calibration: Fixed 180°F open and 120°F close auto limit switch settings prevent nuisance tripping while ensuring high-limit protection.
• OEM Standards: Eliminates the risks associated with generic L180-60 limit switches by matching exact York/Johnson Controls electrical ratings.
• Direct Fitment: Standard mounting footprint allows for rapid swap-outs in tight furnace vestibules, reducing billable labor time.
• Robust SPDT Logic: High-quality single pole double throw architecture supports integrated safety circuits across various furnace platforms.

What causes a York limit switch to trip repeatedly?
Repeated tripping of the S1-025-26366-002 is typically indicative of restricted airflow. Check for a dirty 1" or 4" pleated filter, obstructed return air grilles, or a failing blower motor capacitor that is reducing RPMs.

Is this switch compatible with other York S1-025 series parts?
The York S1-025-26366-002 is part of a specific series of thermal controls. Always verify the temperature stamping on the existing bracket before replacement, as installing a switch with a different thermal profile (e.g., -006 or -008) can cause late-safety activation or premature heat exchanger wear.

How do I test the S1-025-26366-002 in the field?
With the power off, check for continuity across the terminals. At room temperature, the switch should be closed. If the circuit is open while the unit is cool, the internal bimetal disc has likely failed or reached its end of service life.

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.