The Carrier HH18HV160 is an OEM auto-reset high-limit switch engineered to safeguard furnaces and heating systems from dangerous overtemperature conditions. When supply-air temperatures reach the 157–160°F trip threshold, the switch opens the control circuit, shutting down the burner and preventing heat exchanger damage or fire hazard. Once temperatures fall back to a safe level, the switch automatically resets — eliminating the need for manual intervention and reducing service calls.
Key Features
- Auto-reset operation — automatically restores normal function once safe temperatures are reached
- Trip temperature range: 157–160°F
- Direct OEM replacement for compatible Carrier furnace models
- Protects heat exchangers and system components from overheating damage
- Reliable bimetal disc design for consistent, repeatable switching performance
- Easy drop-in installation with OEM mounting configuration
Application
The HH18HV160 is designed as a direct OEM replacement limit switch for Carrier residential and light-commercial furnaces. It mounts in the supply-air plenum or on the heat exchanger casing and monitors air temperature to protect the system during restricted airflow conditions caused by dirty filters, blocked registers, or blower motor faults.
Why Choose an OEM Limit Switch?
- Exact fit and calibration matched to Carrier factory specifications
- Consistent trip and reset points for reliable overheat protection
- Reduces callback risk compared to aftermarket alternatives
- Supports equipment warranty compliance
