543-025

The 3" High Limit Switch L190-30F is a critical safety component designed for residential and commercial HVAC systems and forced-air furnaces. This thermal limit control monitors the heat levels within the appliance's plenum or heat exchanger, acting as a failsafe to prevent overheating. If the temperature exceeds safe operating limits, the switch automatically opens the circuit to shut down the heating element or burner. Featuring an L190-30F calibration, this switch is engineered to trip at 190°F and reset once the temperature cools by 30°F (closing at 160°F). Replacing a malfunctioning high limit sensor is essential for restoring proper heating cycles and protecting your furnace from internal damage. This part is a standard solution for technicians and homeowners looking to fix heating units that are short-cycling or failing to stay on due to safety trips.
Type: High Limit Control Switch
Size: 3-inch
Application: HVAC systems, gas furnaces, electric heaters, and central heating units requiring thermal safety monitoring.
Specifications: Opening Temperature: 190°F; Temperature Differential: 30°F (Closes at 160°F); Reset Type: Automatic; Sensor Type: 3-inch insertion probe.