Carrier Limit Switch HH18HA509

Carrier HH18HA509 Furnace Limit Switch | 155-195° Range

Maintain optimal operating safety and prevent dangerous furnace overheating with the genuine Carrier HH18HA509 Limit Switch. This premium Factory Authorized Part is a critical frontline electronic safety device engineered specifically for Carrier, Bryant, and Payne residential gas furnaces. Positioned inside the main blower vestibule, this switch continuously monitors internal air temperatures. If air temperatures spike past safe operating limits, the switch breaks the electrical safety loop to instantly shut down the gas valve.

Featuring an automatic reset design, the HH18HA509 functions within a factory-calibrated 155 to 195 degree Fahrenheit thermal window, reopening automatically once the furnace heat exchanger cools back down to safe thresholds.

Technical Specifications:

• Model/Part Number: HH18HA509
• Switch Type: High Limit Safety Switch
• Temperature Profile: 155°F to 195°F Limit Range
• Reset Configuration: Automatic Reset
• Voltage Compatibility: 24 VAC Control Circuits
• Application: Residential Gas-Fired Furnaces

Key Features & Benefits:

• Genuine Carrier OEM Quality: This is a brand new, authentic factory-certified component—not an aftermarket substitute. Built to enforce the exact structural safety tolerances and timing thresholds specified by original factory engineers.
• Proactive Burner Shutdown: Safeguards your primary heat exchanger against structural cracking and warping by killing burner fuel delivery the moment internal airflow is restricted.
• Seamless Drop-In Fitment: Features the original factory bracket footprint and standard male spade terminals, allowing technicians to pull a faulty limit switch and complete a replacement in minutes.

Why Buy From Shortys HVAC Supplies?

At Shortys HVAC, we offer exclusively Original Equipment Manufacturer (OEM) parts because there is no room for compromise when repairing furnace safety loops. Installing a genuine Carrier HH18HA509 Switch ensures your heating asset maintains its original ANSI safety ratings, fuel efficiency metrics, and active manufacturer warranty lines.

Shipping Information: We provide fast, competitive shipping rates across the continental United States, delivering critical electronic safety components straight to your door to get your heating loop back online.