Description
Overview
The Carrier HH18HA170 is an OEM replacement high-limit switch designed to protect furnaces from dangerous overheating conditions. Designated as an L170-40F limit switch, this safety control monitors heat exchanger temperatures and interrupts the burner circuit when temperatures exceed the rated set point, preventing equipment damage and potential hazards. It is a direct replacement for Carrier heating systems that specify the HH18HA170 part number.
How It Works
The high-limit switch is a temperature-actuated safety device mounted on or near the furnace heat exchanger. When the surrounding air temperature rises above the open set point, the switch opens the control circuit, shutting down the burner. Once temperatures fall to the reset differential, the switch resets to restore normal furnace operation. This automatic protection cycle helps safeguard both the equipment and the structure it serves.
Key Features
- OEM Carrier replacement part — ensures proper fit and reliable performance
- L170-40F designation: opens at 170°F, 40°F differential (resets at approximately 130°F)
- Protects heat exchanger and furnace components from thermal damage
- Interrupts burner circuit upon high-temperature detection
- Designed for compatibility with Carrier furnace applications specifying HH18HA170
- Compact, durable construction for long service life
Application
- Carrier residential and light commercial gas furnaces
- Direct OEM replacement — no modification required
- Suitable for use wherever the HH18HA170 limit switch is specified
Why Choose OEM Replacement Parts?
Using genuine or OEM-equivalent replacement limit switches ensures your furnace operates within manufacturer-specified safety parameters. Aftermarket substitutes may not provide the precise trip and reset temperatures required, potentially voiding warranties or compromising system safety. The Carrier HH18HA170 is engineered to meet the exact specifications of the original component.
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