Description
Carrier HH18HV131 Automatic Limit Switch Overview
The Carrier HH18HV131 is an OEM automatic-reset limit switch engineered to protect furnaces and heating systems from overheating conditions. Designed as a direct replacement for compatible Carrier heating equipment, this limit switch opens the circuit at 130°F and features a 30°F differential, meaning it automatically resets once the temperature drops back to a safe operating level — eliminating the need for manual intervention and reducing service calls.
Key Features
- OEM Carrier replacement limit switch — SKU HH18HV131
- Opens at 130°F to protect against overheating
- 30°F differential for reliable, stable cycling
- Automatic reset — restores operation once safe temperature is reached
- Direct drop-in replacement for compatible Carrier furnace models
- Helps prevent heat exchanger damage and equipment failure
How It Works
The limit switch continuously monitors the air temperature within the furnace plenum or heat exchanger area. If the temperature rises to the set point of 130°F — due to restricted airflow, a dirty filter, or a blower malfunction — the switch opens and interrupts the burner circuit, shutting down heating to prevent damage. With the automatic reset feature, the switch closes again once the temperature falls by 30°F, restoring normal operation without requiring a technician to manually reset the control.
Application
- Carrier residential and light commercial furnaces
- Gas-fired forced-air heating systems
- Replacement of failed or out-of-tolerance OEM limit switches
Why Choose OEM?
Using a genuine Carrier OEM limit switch ensures proper calibration, fit, and performance. Aftermarket substitutes may not meet the precise temperature tolerances required for safe and efficient furnace operation. The HH18HV131 is built to Carrier’s specifications for long-lasting, dependable protection.
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