Carrier Limit Switch HH18HA496

Carrier HH18HA496 HVAC Safety Limit Switch

Ensure safe, reliable heating operation and protect your furnace from dangerous overheating with the genuine Carrier HH18HA496 Limit Switch. This Factory Authorized Part is a critical safety control engineered specifically for Carrier, Bryant, and Payne residential gas furnaces and packaged heating units. Positioned inside the furnace vestibule, this sensor constantly monitors heat exchanger temperatures, automatically shutting off the main gas valve if internal temperatures exceed safe operating limits.

As a genuine Carrier OEM component, this switch is calibrated to open and close at exact, factory-specified temperatures, preventing unburned gas or cracked heat exchangers caused by restricted airflow or component failures.

Technical Specifications:

  • Model/Part Number: HH18HA496
  • Control Type: Fixed Temperature High-Limit Safety Switch
  • Voltage Compatibility: 24 VAC Control Circuit
  • Frequency: 60 Hz
  • Reset Type: Automatic Reset (Resets once temperatures drop to a safe level)
  • Mounting style: Flat Surface Flange Mount
  • Connections: Standard Spade Terminals for Quick-Connect Wiring

Key Features & Benefits:

  • Genuine Carrier Factory Authorized Part: Built to the exact safety tolerances specified by factory engineers. Unlike generic aftermarket limit switches that may have different temperature trip thresholds, this OEM part guarantees your furnace shuts down safely when it matters most.
  • Vital Thermal Protection: Acts as your system's primary line of defense against over-temperature conditions caused by failing blower motors, blocked flues, or severely clogged air filters.
  • Automatic Reset Function: Once the furnace compartment cools back down to an acceptable temperature, the switch automatically closes the circuit, allowing normal thermostat communication to resume.
  • Corrosion-Resistant Enclosure: Constructed with heavy-duty materials designed to withstand the intense, repeating heat cycles of the furnace burner compartment without drifting out of calibration.

Compatibility & Applications

The HH18HA496 safety switch is widely utilized across standard and high-efficiency residential gas furnaces. It is a direct fit replacement for:

  • Carrier / Bryant / Payne Crosses: Direct replacement for legacy HH18 series limit controls matching this specific temperature specification.
  • Equipment Type: Residential upflow, downflow, and horizontal gas furnaces, as well as split-system heat pump backup heating packages.

Why Buy From Shortys HVAC Supplies?

At Shortys HVAC, we offer only Original Equipment Manufacturer (OEM) parts so your equipment maintains its original safety ratings, mechanical reliability, and factory warranty compliance. When you buy the Carrier HH18HA496 Switch, you are investing in a component tested and approved to protect your property and family.

Shipping Information: We provide competitive, fast shipping rates across the continental United States, ensuring your critical electrical and safety parts arrive quickly to get your heating system back online safely.

$24.00

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  • Model: HH18HA496
  • Manufactured by: Carrier
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