000-163

The Lennox L140-40F High Limit Switch is a vital safety component designed for HVAC systems and forced-air furnaces. This SPDT (Single Pole Double Throw) fan disc control switch acts as a thermal safeguard, monitoring internal temperatures to prevent equipment overheating. When the system reaches its 140°F limit, the switch automatically interrupts the heating circuit to protect the appliance from damage. With its convenient auto-reset feature, the switch restores operation once the temperature cools by its 40°F differential. This high-quality replacement part is essential for maintaining the safe and efficient operation of residential and commercial heating units, ensuring reliable climate control and long-term durability of your HVAC equipment.
Type: High Limit Control Switch
Size: Standard 3/4 inch disc
Application: Used as a safety limit or fan control in forced-air furnaces, rooftop HVAC units, and commercial heating systems to provide thermal protection and circuit management.
Specifications: Switch Type: SPDT (Single Pole Double Throw); Reset Type: Automatic; Open Temperature: 140°F; Close Temperature: 100°F (40°F Differential); Mounting: Surface mount fan disc.