Heil Quaker ICP 1081857 Limit Switch

The Heil Quaker ICP 1081857 Limit Switch is a critical safety component designed for International Comfort Products (ICP) heating systems, including furnaces under the Heil, Tempstar, and Comfortmaker brands. This L175-40 automatic limit switch operates within a precise thermal range of 135?F to 175?F. As a normally closed disc-type temperature control, it acts as a primary safeguard, opening the circuit to the gas valve if the plenum temperature exceeds the 175?F threshold. This prevents heat exchanger damage caused by restricted airflow or blower failure. Engineered for high-cycle reliability, the ICP 1081857 ensures the system returns to operation automatically once temperatures drop back to the safe reset point of 135?F. For HVAC contractors performing furnace troubleshooting, this OEM component is the direct replacement for maintaining the factory-specified safety sequence and preventing system short-cycling.

• OEM Precision: Guaranteed compatibility with ICP Heil Quaker equipment, eliminating the calibration risks associated with universal aftermarket switches.
• Thermal Safety: Features a fixed 175?F trip point to protect the heat exchanger from overheating during airflow restriction events.
• Automatic Reset: The L175-40 logic automatically resets at 135?F, reducing unnecessary service calls for manual resets while ensuring safe operation.
• Technical Reliability: Built to handle the high-amperage demands of 24V control circuits typically found in residential gas furnaces.

What causes a limit switch like the 1081857 to trip frequently?
Frequent tripping usually indicates restricted airflow. Technicians should inspect for clogged air filters, blocked return air ducts, or a failing blower motor that isn't moving enough CFM across the heat exchanger.

Can I test the ICP 1081857 for continuity?
Yes. At room temperature, this switch should show 0 ohms (closed). If the switch shows an open circuit (OL) when the furnace is cool, the internal bimetal disc or contacts have failed and the part requires replacement.

Is this switch compatible with other ICP brands?
Yes, as an ICP replacement part, it is compatible with Arcoaire, Comfortmaker, Day & Night, KeepRite, and Tempstar units that specify part number 1081857.

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.