Heil Quaker ICP 1320365 Limit Switch

The Heil Quaker ICP 1320365 Limit Switch is a critical OEM replacement part designed for high-temperature safety monitoring in residential and commercial furnaces. This L270-20F limit switch functions as a normally closed safety device that opens the electrical circuit when internal plenum temperatures exceed the 270?F threshold, protecting the heat exchanger from thermal stress. Engineered for ICP heating equipment, it features an auto-reset mechanism that restores continuity once the ambient temperature drops by approximately 20?F, typically resetting between 250?F and 270?F depending on the specific furnace cycle and airflow conditions.

For field technicians, the 1320365 furnace limit switch is a direct drop-in for International Comfort Products brands, including Heil, Tempstar, Comfortmaker, and Arcoaire. When diagnosing intermittent "no heat" calls or limit circuit lockouts (often indicated by a 4-flash LED code on many ICP boards), verify that the high limit sensor is not tripping due to restricted return air, a dirty filter, or a failing blower motor before replacing the component. This high-grade bimetal safety switch ensures precise thermal response to maintain system integrity and prevent hazardous overheating conditions.

Key Benefits

• Direct OEM Compatibility: Specifically engineered for a precise fit in Heil, Tempstar, and Arcoaire furnaces, ensuring exact L270-20F temperature calibration.
• Automatic Reset Logic: Eliminates manual intervention by resetting the circuit once temperatures return to a safe 250?F operating range.
• System Protection: Acts as the primary high temperature safety barrier to prevent heat exchanger fatigue and potential fire hazards.
• Rugged Construction: Built to withstand the high-cycle thermal environments found in modern high-efficiency gas furnaces.

Common Questions

What causes a 1320365 limit switch to trip repeatedly?
Frequent tripping is usually caused by restricted airflow. Check for a clogged air filter, closed supply registers, or debris in the blower wheel. If airflow is sufficient and the switch opens below the 270?F rating, the internal bimetal disc may be fatigued, requiring a replacement.

Can this limit switch be used in other furnace brands?
While the L270-20F rating is common, this specific part number is designed for ICP (International Comfort Products) equipment. Always verify the mounting bracket configuration and insertion depth to ensure the sensor sits correctly in the air stream.

How do I test if the ICP 1320365 is defective?
Using a multimeter set to ohms, check for continuity across the terminals while the switch is cool. A functional switch should show 0 ohms (closed). If the circuit is open at room temperature, the limit switch has failed and must be replaced.

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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.