Description
Carrier HH18HA435 AUTO Limit Switch Overview
The Carrier HH18HA435 is a genuine OEM automatic (AUTO) limit switch designed to protect furnaces and heating systems from dangerous overtemperature conditions. With a sensing range of 100–135°F, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the safe operating threshold — then automatically resets once temperatures return to normal operating range.
Key Features
- Genuine Carrier OEM replacement limit switch
- AUTO reset operation — automatically resets when temperature returns to safe range
- Temperature sensing range: 100–135°F
- Protects furnace heat exchanger from overheating and thermal damage
- Direct OEM replacement for compatible Carrier furnace models
- Reliable bimetal or disc-type sensing element for accurate temperature response
Application
The HH18HA435 limit switch is used in Carrier residential and light commercial furnaces as a primary high-temperature safety control. It is mounted on or near the heat exchanger and interrupts the gas valve or burner circuit when the supply air temperature exceeds the set point, preventing heat exchanger damage, nuisance tripping, and potential fire hazards.
Why Choose a Genuine OEM Limit Switch?
Using a genuine Carrier OEM limit switch ensures proper calibration, reliable performance, and compatibility with your specific equipment. Aftermarket substitutes may not meet the original factory specifications, potentially compromising system safety and efficiency.
Specifications
- Brand: Carrier
- Part Number: HH18HA435
- Type: Automatic (AUTO) Reset Limit Switch
- Temperature Range: 100–135°F
- Application: Furnace overheat protection
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