Heil Quaker ICP 1184423 Limit Switch

The Heil Quaker ICP 1184423 Limit Switch is a critical safety component designed for International Comfort Products residential and commercial furnace systems. This L165-20F limit switch serves as a primary thermal cutoff, monitoring the heat exchanger temperature to prevent unsafe operating conditions. Engineered with a fixed 165°F opening point (Cut-Out) and a 145°F closing point (Cut-In) with a 20°F differential, this SPST normally closed switch ensures the burner circuit is interrupted if airflow is restricted or the system overheats. As a genuine OEM replacement part, it offers a direct drop-in fit for Heil, Tempstar, Comfortmaker, and Arcoaire models, maintaining the original equipment’s UL certification and safety benchmarks. High-quality bimetal disc construction provides precise snap-disc action for reliable temperature regulation. Replacing a fouled or failing furnace high limit switch is essential to resolve symptoms like short-cycling or the blower motor running continuously while the burners stay off.

• Precise Thermal Calibration: Features a factory-set 165°F trip point for overheat protection and system integrity.
• OEM Compatibility: Replaces ICP 1184423, 338085-403, and 60T11, ensuring exact electrical and physical mounting specs.
• Automatic Reset Function: Once the temperature drops below the 145°F threshold, the switch automatically resets to restore normal furnace operation.
• Enhanced Safety: Acts as the primary furnace safety sensor to prevent heat exchanger damage and potential fire hazards.
• Wide Application: Compatible with various 80% and 90% AFUE gas furnaces from Heil Quaker and other ICP brands.

What does the L165-20F code mean?
The "L" stands for Limit, "165" is the opening temperature (Fahrenheit) where the circuit breaks, and "20F" is the differential, meaning the switch will close again once the temperature drops 20 degrees to 145°F.

What causes this limit switch to trip repeatedly?
Frequent trips are usually caused by restricted airflow. Before replacing the switch, check for a clogged air filter, blocked return grilles, a dirty evaporator coil, or a failing blower motor.

How can I test if my 1184423 switch is defective?
Using a multimeter set to continuity, you should see a closed circuit (0 ohms) across the terminals at room temperature. If the switch remains open (infinite ohms) when cool, it has failed and requires immediate replacement.

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.