OEM Lennox Limit Switch — 49L95

The genuine OEM Lennox 49L95 limit switch is a critical safety control that monitors temperature inside your Lennox furnace. Mounted on or near the heat exchanger, it opens the circuit to shut off the burners if the plenum gets too hot, protecting against overheating from restricted airflow or blower failure. Calibrated to Lennox factory trip points, it delivers accurate, dependable protection.

A failing or tripped limit switch shows clear warning signs: the furnace short-cycles by firing and shutting off repeatedly, the burners ignite but the system quickly cuts out on high temperature, the blower runs continuously, or the furnace fails to produce heat at all. Because a dirty filter or weak blower often trips the switch first, it's worth checking airflow alongside replacing a worn switch.

Installing the OEM 49L95 is important for safe Lennox operation. Its temperature rating and trip setpoint are matched to your furnace's heat exchanger design. A mismatched aftermarket switch may trip too early, causing nuisance shutdowns, or too late, allowing unsafe overheating. This factory-authorized part restores proper safety response and reliable, worry-free heating.