OEM Lennox Limit Switch w/ Manual Reset — 28G46

The genuine OEM Lennox 28G46 limit switch with manual reset is a critical safety control that monitors the temperature inside your furnace. If the heat exchanger area exceeds a safe threshold—typically due to restricted airflow—the switch opens and shuts off the burners to prevent dangerous overheating. Its manual reset design requires a deliberate button press to restore operation after a trip, alerting you that an underlying problem occurred.

Common signs of a failing limit switch include a furnace that repeatedly trips off on high limit, burners that short-cycle, or a unit that won't restart even after cooling down. Dirty filters, blocked ducts, or a failing blower can cause nuisance trips, while a worn switch may fail open and prevent heating altogether.

Using the OEM Lennox 28G46 ensures the exact temperature trip point and reset behavior your furnace was designed for. Because this is a safety-rated component, generic substitutes with the wrong setpoint can compromise protection or allow unsafe operation. A factory-matched limit switch keeps your Lennox equipment protected and reliable.