Carrier HH12HV151 Limit Switch

The Carrier HH12HV151 Limit Switch is a critical OEM replacement part designed for precise thermal regulation within Carrier, Bryant, and Payne furnace air handlers. Engineered as a primary safety limit control, this snap-action switch monitors the heat exchanger temperature to prevent overheating and potential component damage. It utilizes a fixed temperature setting to open the electrical circuit if the internal plenum temperature exceeds factory specifications, effectively shutting down the gas valve or heating element until the system cools to a safe auto-reset threshold. For contractors, the HH12HV151 ensures a drop-in fit with standard mounting footprints, maintaining the UL-certified safety profile of the original equipment. This rollout switch and high-limit component is essential for resolving furnace short cycling or blower motor sequencing issues caused by a failing or tripped thermal disc. Using genuine Carrier parts like the HH12HV151 furnace limit guarantees compatibility with 59SC and similar high-efficiency condensing units, providing reliable overheat protection and system longevity on every service call.

• OEM Precision: Guaranteed factory-calibrated trip points for accurate high-limit protection.
• Durable Construction: Built with high-grade bimetal discs to withstand thousands of thermal cycles without drifting.
• Simplified Installation: Standard spade terminal connections and mounting bracket for fast field replacement.
• System Safety: Crucial for preventing heat exchanger cracks and operational hazards in residential furnaces.

• My furnace is short cycling; could this limit be the cause? Yes, if the HH12HV151 detects restricted airflow or an over-fired burner, it will trip to protect the unit, causing the furnace to cycle prematurely.
• Is this an auto-reset or manual reset switch? This specific model is an automatic reset limit switch, meaning it will close the circuit again once the temperature drops below its differential set point.
• Can I use this switch in a Bryant or Payne unit? Yes, since Carrier is the parent company, this cross-brand compatible switch is the correct service part for many Bryant and Payne gas furnace models.

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.