OEM Lennox Limit Switch Kit — 50L98

The genuine OEM Lennox 50L98 limit switch kit is the high-temperature safety control that monitors the heat exchanger and plenum in your Lennox furnace. If temperatures climb beyond the safe threshold, the switch opens to shut off the burners, protecting the heat exchanger from cracking and preventing a dangerous overheat condition. It also helps control blower timing for efficient, comfortable heating.

Common failure symptoms: A failed limit switch commonly causes short cycling (the furnace lights, then shuts off on high limit), no heat, a blower that runs constantly, or repeated lockouts. Nuisance tripping from a weak or out-of-spec switch is a frequent no-heat service call, especially when airflow is marginal.

Why OEM matters: The Lennox 50L98 is set to the precise trip temperature and reset point your furnace was engineered for, with the correct mounting and terminal configuration. A universal switch with the wrong temperature rating can trip too early — killing heat unnecessarily — or too late, defeating a critical safety function. Choose the factory OEM part for reliable protection and a guaranteed fit. In stock and ships same day before 3PM CST.