Lennox 21L89 Limit Switch The unit is built with

The unit is built with a 24VAC coil and is rated for 30 amps inductive or 40 amps resistive loads

the Q101 protects the heat exchanger and improves airflow delivery across the coil

If the switch shows no continuity at room temperature

Always verify lead length to ensure the 36-inch reach is sufficient for your specific appliance footprint

Lennox 21L89 Limit Switch The unit is built withThe Lennox 21L89 Limit Switch is a critical safety component designed for precise thermal regulation in Lennox HVAC systems. This auto limit switch features a 3 inch insert and is engineered to open the electrical circuit if the heat exchanger temperatures reach the 210F to 240F range. As a direct OEM replacement part, the 21L89 is identical to the 21L8901, ensuring a drop in fit for contractors maintaining residential furnaces and air handlers. This