Lennox 42J03 Limit Switch Automatic Reset Functionality: Eliminates manual

Automatic Reset Functionality: Eliminates manual intervention by self-resetting after the system cools to safe parameters

Utilizing a genuine Trane replacement part ensures that the electrical specs precisely match the system’s original engineering requirements

or a visible loss of tension in the actuator assembly

As a genuine York HVAC replacement part

and 143-80-6 models

Lennox 42J03 Limit Switch Automatic Reset Functionality: Eliminates manualThe 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