Carrier HH19ZA170 Switch

The Carrier HH19ZA170 is a high-limit HVAC temperature safety switch engineered for critical thermal protection in residential and commercial furnaces. As a genuine OEM replacement part, this 170 degree limit switch is calibrated to effectively interrupt the heating cycle if the internal plenum temperature reaches its thermal cutout threshold of 170°F. The HH19ZA170 limit switch serves as a mandatory safeguard, preventing heat exchanger damage and ensuring the unit operates within manufacturer-specified safety parameters. This auto-reset limit switch features a 130°F closing circuit, allowing the system to resume normal operation once temperatures have stabilized to a safe level. Designed for precision, the Carrier HH19ZA170 provides a direct fit for various Bryant, Payne, and Carrier furnace models. For technicians, this furnace limit control offers a standard two-pin terminal configuration for rapid installation during service calls. Utilizing OEM HVAC components like the Carrier HH19ZA170 ensures consistent performance and maintains the integrity of the original airflow and safety design without the reliability risks associated with universal aftermarket alternatives.

• Precise Thermal Calibration: Fixed 170°F open and 130°F close points ensure accurate furnace over-temperature protection.
• OEM Compatibility: Guaranteed bolt-on fitment for specific Carrier heating systems, reducing diagnostic time.
• Automatic Reset Logic: Eliminates the need for manual intervention once the plenum temperature drops back to 130°F.
• Safety Compliance: Meets all original factory specifications for HVAC high-limit switch safety standards.
• Heavy-Duty Construction: Built to withstand the high-cycle demands of modern gas and electric furnace environments.

What causes a Carrier HH19ZA170 to trip frequently?
Frequent tripping usually indicates restricted airflow. Check for a dirty HVAC air filter, blocked return ducts, or a failing blower motor. If the switch opens below 170°F, it may have drifted out of calibration and requires replacement.

Is the Carrier HH19ZA170 an auto-reset or manual-reset switch?
This is a self-resetting limit switch. It will automatically close the circuit and allow the burners to ignite once the temperature falls below the 130°F reset point.

Can I use a different temperature-rated switch to prevent nuisance trips?
No. Always replace with the exact HH19ZA170 (170-Open/130-Close) rating. Using a higher-rated switch can lead to heat exchanger fatigue and creates a significant safety hazard.

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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.