The Carrier HH18HA430 Limit Switch is a critical safety component designed for precise thermal regulation within high-performance HVAC systems. As an OEM Carrier replacement part, this auto-reset limit switch features a calibrated 100-130F temperature range, ensuring the system maintains safe operating parameters by interrupting the circuit when the high-limit threshold is reached. Engineered for reliability in the field, it functions as a furnace high limit switch that prevents heat exchanger damage and potentially hazardous overheating conditions in residential and light commercial equipment.

This Carrier 100-130F limit switch is built to withstand rigorous cycling, providing a seamless cut-out at 130°F and a vertical cut-in at 100°F. Whether you are servicing a Carrier, Bryant, or Payne furnace, this component ensures the automated temperature control required for modern air handlers and packaged units. Its compact 1.1-inch design allows for straightforward integration into existing safety loops, making it an essential stock item for any contractor specializing in Carrier HVAC parts and troubleshooting airflow or venting issues.

• Direct OEM Compatibility: Guaranteed fit and function for specific Carrier, Bryant, and Payne models, including 48VG and 588ANW series.
• Fixed Thermal Calibration: Precise 100°F to 130°F range provides consistent protection against overheating without the need for manual adjustment.
• Auto-Reset Functionality: Automatically restores the circuit once temperatures drop below 100°F, reducing unnecessary service calls for simple thermal trips.
• Durable Construction: Heavy-duty internal contacts designed to manage the high-cycling demands of modern heating and cooling systems.

Is the HH18HA430 compatible with other brands?
Yes, as a Factory Original Replacement, it is frequently used across the ICP family of brands, including Bryant and Payne, provided the technical specifications and temperature ranges match the original equipment tag.

What causes this limit switch to trip frequently?
Frequent tripping usually indicates underlying HVAC airflow issues, such as a clogged filter, a failing inducer motor, or restricted ductwork that causes the heat exchanger to exceed the 130°F cut-out.

How do I test a limit switch for failure?
Use a multimeter to check for electrical continuity. If the switch is cool (below 100°F) and shows an open circuit, the internal bimetal disc or contacts have failed and the part requires immediate replacement.

Non Cancelable / Non Returnable

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.