York S1-2985-3181 160-190F AUTO Limit Switch

The York S1-2985-3181 is an OEM auto-reset high-limit switch engineered to protect York furnaces and heating systems from dangerous overheating conditions. Designed as a direct factory replacement, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the rated threshold, then resets automatically once safe operating temperatures are restored.

Key Features

• Auto-reset operation — no manual intervention required after the system cools to a safe temperature
• Trip range: 160°F to 190°F for precise high-limit protection
• Direct OEM replacement for compatible York heating systems
• Protects heat exchangers and furnace components from thermal damage
• Reliable bimetal or disc-type sensing element for consistent, repeatable performance
• Designed for easy installation in existing York furnace limit switch mounting locations

Application

This limit switch is a genuine York OEM part intended for use in York residential and light commercial furnaces and air handlers. It serves as a critical safety device, shutting down burner operation when supply air or heat exchanger temperatures rise above the rated set point. The automatic reset function allows normal system operation to resume once temperatures return to a safe level, minimizing service call requirements.

Specifications

• Part Number: S1-2985-3181
• Brand: York (OEM)
• Trip Temperature Range: 160°F – 190°F
• Reset Type: Automatic (AUTO)
• Function: High-limit overheat protection

Why Choose OEM?

Using a genuine York OEM limit switch ensures proper fit, function, and compatibility with your York heating equipment. OEM parts maintain manufacturer warranty compliance and deliver the reliability your customers expect.