Description
Overview
The Carrier HH18HA440 is a genuine OEM automatic reset limit switch designed to protect Carrier heating systems from unsafe operating temperatures. With a switching range of 100–140°F, this limit switch monitors heat exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the set threshold — then resets automatically once safe operating conditions are restored.
Key Features
- Genuine Carrier OEM replacement part (SKU: HH18HA440)
- Auto (automatic) reset operation — resets once temperature returns to safe range
- Temperature range: 100–140°F
- Designed to prevent furnace overheating and heat exchanger damage
- Direct OEM replacement for compatible Carrier furnace models
- Reliable, consistent performance for residential and light commercial applications
Application
This limit switch is a critical safety component in Carrier gas and electric furnaces. It is engineered to shut down burner operation when supply air or heat exchanger temperatures rise above the rated limit, protecting the system from thermal damage and ensuring safe operation. The automatic reset function eliminates the need for manual intervention after a nuisance trip, making it ideal for both service technicians and facility managers.
Installation Notes
- Always verify compatibility with your specific Carrier furnace model before installation
- Disconnect power before servicing or replacing limit switches
- Consult the equipment service manual for proper mounting location and wiring
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