Lennox 42J03 Limit Switch verify the furnace’s technical data

verify the furnace’s technical data sheet to ensure this scroll matches the inducer assembly design

or "cherry-red" hotspots on the tube surface that cannot be brushed away

and 143-80-6 models

or a visible loss of tension in the actuator assembly

Industrial-Grade Durability: Resists degradation from harsh environments and varying temperatures common in heavy-duty HVACR applications

Lennox 42J03 Limit Switch verify the furnace’s technical dataThe Lennox 42J03 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This genuine OEM replacement part, also identified as part number 42J0301, features a fixed temperature range of 150 190F with an automatic reset function. As a veteran grade furnace high limit switch, it monitors the plenum temperature and breaks the electrical circuit to the gas valve if overheating is