York S1-026-34028-005 Limit Switch

The York S1-026-34028-005 Limit Switch is a mission-critical OEM replacement furnace part designed for high-limit protection in gas furnaces and air handling units. This automatic reset limit switch operates with a 180°F opening temperature and a 150°F closing temperature, ensuring the heat exchanger does not exceed safe operating parameters. As the direct replacement for S1-2702-338P/A, this 150-180F AUTO limit control maintains precise thermal regulation without the need for manual intervention after a trip event. Field technicians will find the 5-inch insertion length compatible with common York and Source 1 equipment, including model BGM07516BD. Constructed for durability in high-cycle environments, this York HVAC safety switch prevents thermal runaway by interrupting the burner circuit if airflow is restricted or internal temperatures spike, protecting the system from permanent damage.

Key Benefits

• Direct OEM Compatibility: Engineered as the specific S1-2702-338P/A replacement to ensure exact electrical and physical fitment.
• Automatic Reset Functionality: Restores circuit continuity once the plenum cools to 150°F, reducing unnecessary service calls for simple over-temp events.
• High-Limit Protection: Prevents heat exchanger fatigue and failure by strictly enforcing a 180°F maximum operating threshold.
• Industrial-Grade Construction: Built to withstand the constant thermal expansion and contraction cycles of professional HVACR systems.

Common Questions

What causes this limit switch to trip repeatedly?
Frequent tripping usually indicates restricted airflow, often due to a clogged air filter, undersized ductwork, or a failing blower motor. Ensure the system is moving the rated CFM before replacing the switch.

Is this switch compatible with other manufacturer brands?
While primarily used in York, Luxaire, and Coleman equipment, compatibility is strictly determined by the temperature setpoints and insertion length. Always verify the 180/150 rating against the original part specifications.

How do I test if the S1-026-34028-005 is defective?
With power disconnected, check for continuity across the terminals. At room temperature, this switch should be normally closed (NC). If the circuit is open while the furnace is cool, the switch has failed 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.