York S1-7995-3281/A Limit Switch

For veteran technicians and mechanical contractors maintaining residential heating systems, the York S1-7995-3281/A Limit Switch is a critical safety component designed for precise thermal regulation. This 120-150F AUTO Limit Switch functions as a high-limit safety cutoff, monitoring internal plenum temperatures to prevent heat exchanger damage or unsafe operating conditions. Engineerd for York, Coleman, and Evcon furnaces, this high-limit replacement part automatically opens the circuit when the temperature hits 150°F and resets once it cools to 120°F. As an OEM HVAC safety switch, it provides the standard calibration needed for factory-spec performance, ensuring compatibility with furnace limit control sequences. Using a genuine Source 1 S1-7995-3281/A maintains the integrity of the safety loop, preventing furnace short cycling and blower motor malfunctions often caused by out-of-spec aftermarket alternatives. This fan limit switch is a direct replacement for Therm-O-Disc 60T11-312490, offering the exact footprint required for rapid field installation during emergency repairs.

• Precise Thermal Calibration: Designed with a 150°F open and 120°F close threshold to protect the heat exchanger from overheating.
• Automatic Reset Logic: The S1-7995-3281/A resets without manual intervention, restoring system operation once safe temperatures are reached.
• Direct OEM Compatibility: Specifically engineered for York, Coleman, and Evcon DGAT/CGAT series, ensuring a drop-in fit.
• Enhanced System Safety: Critical for preventing burner operation during fan failure or restricted airflow conditions.

What are the symptoms of a failing York limit switch?
Common indicators include the furnace blower running constantly without heat, the burners failing to stay lit, or the system frequently cycling on and off. If the switch remains open, the HVAC control board will typically throw a specific flash code indicating a limit circuit fault.

Is the S1-7995-3281/A a manual or automatic reset?
This is an automatic reset limit switch. Unlike manual resets found in the upper blower deck, this model resumes conductivity once the temperature drops back down to 120°F.

Can I use this switch in non-York equipment?
While technically compatible with certain Coleman and Evcon furnaces, always verify the temperature stamps on your existing switch. Replacing a high-limit switch with one that has a different temperature rating can lead to premature system failure or hazardous fire risks.

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.