International Comfort Products 1171904 Furnace High Limit Switch - L145-55F

The International Comfort Products 1171904 is an OEM replacement L145-55F high limit switch engineered for ICP, Heil, Tempstar, and Heil Quaker furnaces and HVAC systems. This safety-critical component monitors heat exchanger temperature and automatically interrupts the heating circuit when temperatures exceed safe operating thresholds, protecting the furnace and surrounding equipment from heat damage.

Key Specifications:

• Part Number: 1171904
• Switch Designation: L145-55F
• High Limit Trip Point: 145°F (opens circuit at 145°F)
• Differential: 55°F (closes/resets at approximately 90°F)
• OEM Replacement: Direct factory replacement for ICP / Heil / Tempstar / Heil Quaker equipment

Key Features:

• Automatic reset design — restores operation once temperature drops to safe levels
• Precise temperature calibration for consistent, reliable protection
• Compact form factor for straightforward installation in the original mounting location
• Manufactured to original equipment specifications for assured fit and function
• Compatible with residential gas and electric furnace applications

The 1171904 limit switch is a direct OEM part sourced from International Comfort Products (ICP), ensuring a precise fit and long-term reliability in qualifying furnace models. Replacing a failed or suspect limit switch with the correct OEM part helps maintain proper furnace operation, energy efficiency, and household safety.