Carrier HH12ZB200 Limit Switch

The Carrier HH12ZB200 Limit Switch is a critical OEM replacement part engineered for precise thermal protection in residential and light commercial furnaces. This auto reset limit switch features a 3-inch insertion depth and is factory-calibrated for an L200-40 configuration, meaning it opens on a temperature rise at 200°F and automatically closes once the system cools to 160°F. As a furnace high limit thermostat, it prevents internal heat exchanger temperatures from exceeding safe operational limits, mitigating the risk of component fatigue or safety failures. The HH12ZB200 is the sanctioned direct replacement for HH12ZA199, HH12ZA201, and HH12ZA200, ensuring seamless compatibility with Carrier, Bryant, and Payne equipment. Its SPST (Single Pole Single Throw) normally closed circuit design orients it for high-reliability applications where automatic reset functionality is required to restore unit operation without manual intervention. Professionals prioritize this factory authorized part for its exact electrical ratings and mounting footprint, maintaining the integrity of the original system design.

• Precise Thermal Cut-Out: Pre-set 200°F opening temperature provides essential overheat protection to protect the heat exchanger.
• Automatic Reset Logic: Closes at 160°F, allowing the furnace to resume normal heating cycles without technician field-reset.
• Broad ICP Compatibility: Officially replaces HH12ZA199 and other legacy Carrier furnace parts, reducing inventory complexity for contractors.
• High-Durability Construction: Built to withstand the harsh environment of a furnace plenum, ensuring long-term HVAC system performance.

What are the symptoms of a failing furnace limit switch?
If the Carrier HH12ZB200 fails, you will often see the indoor blower motor running continuously while the burners fail to ignite, or the system may exhibit short-cycling as it hits the 200°F high limit prematurely due to airflow restrictions.

Is the HH12ZB200 compatible with older Bryant or Payne units?
Yes, this is a universal Carrier replacement part that fits a wide range of 58GP and 330AAV models. It is designed to match the specific limit control specs of legacy ICP brand equipment.

What causes this limit switch to trip repeatedly?
Repeated tripping at 200°F usually indicates a broader system issue such as a dirty air filter, failing blower motor, or restricted ductwork rather than a faulty auto limit switch itself.

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.