Heil Quaker ICP 1186925 Limit Switch

The Heil Quaker ICP 1186925 Limit Switch is a critical OEM replacement part designed to ensure high-limit safety and operational integrity in Heil, Tempstar, and Arcoaire furnaces. As a primary safety device, this fixed-temperature limit switch monitors the heat exchanger’s plenum temperature, automatically breaking the electrical circuit to the gas valve if temperatures exceed safe operating parameters. This prevents thermal stress and potential heat exchanger fatigue. Engineered for ICP (International Comfort Products) equipment, the 1186925 provides precise thermal cutout protection, ensuring that the blower motor and burner assembly operate within the manufacturer's specified duty cycles. Its disc-style design allows for consistent furnace high limit sensing and reliable reset performance after a cooling period. When troubleshooting a system that is short-cycling or stuck in a lockout mode, verifying the continuity of the 1186925 switch is a standard diagnostic step for any veteran technician. This genuine ICP HVAC part ensures exact mounting hole alignment and terminal compatibility, eliminating the calibration drift often found in universal aftermarket alternatives.

• OEM Compatibility: Seamlessly integrates with ICP, Comfortmaker, and KeepRite furnace control logic without wiring modifications.
• System Protection: Acts as a fail-safe thermal switch to prevent cabinet overheating and manifold damage.
• Precision Calibration: Factory-set temperature limits ensure accurate high-limit tripping for maximum equipment longevity.
• Durability: Constructed with high-grade bimetal sensing elements to withstand frequent thermal cycling in residential gas furnaces.

What are the symptoms of a faulty 1186925 limit switch?
Common signs include the furnace blower running continuously while the burner remains off, or the system shutting down shortly after the ignition sequence begins. If the switch remains electrically open, the control board will typically flash a specific diagnostic code indicating a limit circuit lockout.

Can I use a universal limit switch instead of the ICP 1186925?
While universal switches exist, they often lack the exact temperature setpoint and insertion depth required for ICP heat exchangers. Using the genuine 1186925 ensures the system trips at the precise manufacturer-specified temperature, maintaining the safety listing of the appliance.

Is this switch a manual or automatic reset?
The 1186925 is an automatic reset limit switch. Once the plenum temperature drops below the reset differential, the internal contacts will close, allowing the heating cycle to resume provided the primary controller is not in a hard lockout.

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.