Lennox 18J28 Limit Switch oil-filled dielectric fluid within a

oil-filled dielectric fluid within a robust aluminum housing for superior thermal dissipation and pressure-sensitive internal protection

carbon dioxide

ensuring a fast and secure interface for technicians during field replacements

allows for flexible directional aiming

securing reliable operation in gas-fired heating environments

Lennox 18J28 Limit Switch oil-filled dielectric fluid within aWhen 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