York S1-024-35658-000 Limit Control

The York S1-024-35658-000 Limit Control is a critical safety component used across a wide range of York HVAC systems, including residential furnaces and air handlers. Engineered with a fixed 170°F opening temperature and a 50°F closing differential, this high-limit switch protects the heat exchanger and surrounding components from thermal damage by interrupting 24V control power if internal temperatures exceed safe operating parameters. As a direct OEM replacement for part 111002050, it ensures proper fitment and prevents the nuisance trips often associated with generic aftermarket controls.

For technicians troubleshooting a "4 red flashes" fault code on York equipment, replacing the limit control 170Op 50Cl is a standard protocol once airflow restrictions are ruled out. This HVAC high limit switch is designed for high-cycle reliability in demanding environments, maintaining system integrity and operational safety. Its bimetal disc construction provides precise thermal response, ensuring the blower continues to circulate air during a high-limit event to dissipate latent heat effectively.

• Direct OEM Compatibility: Verified replacement for York S1-024-35658-000 and 111002050, eliminating mounting and wiring complications.
• Precise Thermal Calibration: Fixed 170°F trip point prevents overheating without premature shut-offs, maintaining HVAC system efficiency.
• Safety System Integrity: Prevents furnace operation during restricted airflow or blower failure, protecting the primary heat exchanger.
• Standardized Fitment: Designed for rapid installation in the furnace plenum or blower housing using existing terminal leads.

What are the symptoms of a failing high limit switch?
Common signs include the furnace shutting down before the thermostat reaches its set point, "Limit Switch Open" error codes (often 4 flashes on York boards), or the blower motor running continuously while the heat remains off.

Can I use a limit control with a different temperature rating?
No. Using a switch with a higher opening temperature can cause severe damage to the heat exchanger or lead to unsafe operating conditions. Always match the 170°F specification of the S1-024-35658-000.

Is this an auto-reset or manual-reset control?
This model is an auto-reset limit control. It will automatically close and allow the system to resume operation once the temperature drops below the 50°F differential (approximately 120°F).

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.