Carrier HH18HV160 Limit Switch

The Carrier HH18HV160 Limit Switch is a critical safety component engineered for precise thermal management in residential and commercial furnaces. This OEM Carrier replacement part functions as a high-limit safety cut-out, specifically calibrated to a 157-160F temperature range to prevent heat exchanger damage and hazardous overheating conditions. Utilizing a highly responsive bimetallic sensor, this auto reset limit switch automatically opens the electrical circuit to the gas valve or ignition control if internal plenum temperatures exceed safe thresholds, then closes once the system cools to an acceptable operating level. Designed for a drop-in fit, the HH18HV160 is built to withstand the rigorous cycling common in high-efficiency HVAC equipment. For field technicians, verifying the L160-3 or similar temperature stamping is essential for maintaining the correct safety roll-out and limit parameters. Rely on this genuine furnace limit switch to restore factory-spec operation, ensure proper blower fan timing, and protect against restricted airflow issues.

• Precise Thermal Calibration: Designed for an exact 157°F to 160°F triggering point to ensure system protection without premature tripping.
• Auto Reset Functionality: Automatically restores the circuit once the furnace cools, reducing unnecessary manual resets after minor airflow fluctuations.
• OEM Durability: Constructed with high-grade bimetallic contacts for long-term reliability in high-cycle environments.
• Direct Fit Compatibility: Standardized mounting footprint allows for rapid installation in Carrier, Bryant, and Payne heating units.

• How do I know if my HH18HV160 is faulty? If your furnace blower runs continuously while the burners shut off quickly, or if the system short-cycles without reaching the thermostat setpoint, the limit switch may be stuck open or out of calibration.
• What causes this limit switch to trip frequently? Frequent tripping is usually caused by restricted airflow, such as a dirty 1" pleated filter, blocked return vents, or a failing blower motor, which leads to excessive heat buildup in the plenum.
• Can I use a switch with a different temperature rating? No. You should always match the temperature rating (157-160F) specified by the manufacturer to maintain the engineered safety profile and prevent heat exchanger fatigue.

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.