York S1-025-26366-001 Limit Switch

The York S1-025-26366-001 is a high-precision HVAC furnace limit switch engineered for critical temperature regulation within commercial and residential gas-fired units. This OEM York replacement part features a standardized SPDT configuration designed to disrupt the burner circuit if heat exchanger temperatures exceed safe operating parameters. Operating on an auto-reset thermal disk mechanism, the unit is calibrated for an operating temperature range of 105°F to 185°F, ensuring the blower assembly maintains proper airflow to dissipate heat while preventing structural damage from over-firing. As a primary furnace safety sensor, it provides reliable cycling for York, Luxaire, and Coleman equipment including the D2CG036N08225A platform. For contractors troubleshooting frequent furnace cycling or "limit open" fault codes, this 105-185F auto limit switch offers the specific millivolt and voltage compatibility required to restore 24V control circuit integrity without the drift common in generic aftermarket sensors. Professional installation ensures the thermal probe and mounting flange maintain the specific depth needed for accurate sensing within the plenum.

Key Benefits for HVAC Professionals

• Precision Calibrated Protection: Fixed 185°F cutout and 105°F differential prevent heat exchanger fatigue and potential stress fractures.
• Genuine OEM Reliability: Meets exact York S1-025-26366-001 specifications for resistance and response time, ensuring the control board recognizes the signal immediately.
• Automatic Reset Logic: Eliminates manual intervention after transient overheat events, simplifying system recovery once standard airflow is restored.
• Cross-Brand Compatibility: Direct fit for numerous Source 1 HVAC parts applications across the Johnson Controls (JCI) family of products.

Common Questions About This Limit Switch

What causes a York S1-025-26366-001 to trip frequently?
Repeated tripping typically indicates restricted airflow from a clogged air filter, a failing blower motor, or undersized ductwork causing the heat exchanger to reach the 185°F limit prematurely.

Is this switch compatible with 24V and 120V circuits?
Yes, this limit control switch is typically utilized in the 24V safety string but is rated for standard pilot duty applications found in York gas furnaces and package units.

Can I use a manual reset switch to replace this auto-reset model?
No. Safety protocols require using the specific reset type designated by the manufacturer. Replacing an auto-reset limit switch with a manual version can lead to nuisance lockouts and system downtime.

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.