Carrier HH19ZA955 Limit Switch

The Carrier HH19ZA955 Limit Switch is a critical high-limit safety component engineered for precise thermal monitoring in Carrier furnace parts and residential HVAC systems. Designed with an auto-reset function, this 100-155F limit switch ensures the equipment operates within safe parameters by breaking the electrical circuit if the heat exchanger temperatures exceed the maximum set point. As a factory authorized part, it provides a direct replacement for OEM HVAC controls, ensuring seamless integration with existing furnace control boards and safety loops.

For technicians in the field, the HH19ZA955 represents a reliable solution for recurring thermal trip issues or failed limit switches that compromise system safety. This HVAC temperature limit switch is built to withstand high-cycling environments, preventing premature failure and maintaining the integrity of the heating cycle. Its compact footprint and standard mounting ensure a straightforward installation for contractors servicing Carrier, Bryant, or Payne equipment where a fixed temperature limit switch is required for over-temperature protection.

Key Benefits

• Precise Thermal Range: Optimized for 100-155°F operation to protect the heat exchanger and internal components.
• Auto-Reset Functionality: Automatically restores the circuit once the system cools to a safe temperature, reducing unnecessary service calls for manual resets.
• OEM Compatibility: Designed specifically for Carrier-family equipment to ensure correct fitment and electrical calibration.
• Durable Construction: Engineered to professional standards to resist vibration and thermal stress in demanding furnace environments.

Common Questions

How do I know if my Carrier limit switch is failing?
Technicians typically observe short-cycling, the indoor blower running continuously, or the unit failing to ignite with a specific flash code on the control board indicating an open limit circuit.

Can I replace this switch with a higher temperature rating?
No. For safety and compliance with the original equipment design, always replace a limit switch with the exact thermal rating specified by the manufacturer (100-155°F for the HH19ZA955).

Is this switch compatible with other HVAC brands?
While primarily used in Carrier, Bryant, and Payne units, it may fit other systems requiring a 100-155°F auto-reset switch. Verify the mounting depth and electrical ratings before cross-referencing.

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.