Lennox 18J28 Limit Switch requiring a manual reset to

requiring a manual reset to ensure a technician inspects the underlying cause of the overheat

which prevents premature failure in high-ambient environments

Operating with a 24V coil

and TP973 models

securing reliable operation in gas-fired heating environments

Lennox 18J28 Limit Switch requiring a manual reset toWhen you're troubleshooting a furnace that's short cycling or a blower motor that won't quit, the Lennox 18J28 Limit Switch is a primary diagnostic point. This genuine OEM furnace high limit switch is a critical safety component designed to monitor heat exchanger temperatures and prevent hazardous overheating. Featuring a 165F CO (Cut Out) and 135F CI (Cut In) thermal profile, this auto reset limit switch ensures the burner circuit opens if internal