Lennox 79J89 Limit Switch 'close on fall' means the

'close on fall' means the electrical circuit completes when the negative pressure (vacuum) reaches the designated set point of -

a failed blower motor

ensuring a drop-in fit with existing mounting holes and standard spade connector terminals

this modern OEM replacement gasket is manufactured using advanced heat-resistant synthetic materials and does not contain asbestos

When you're troubleshooting a system that keeps short cycling or tripping on low pressure

Lennox 79J89 Limit Switch 'close on fall' means theThe Lennox 79J89 Limit Switch is a critical OEM replacement part designed for precise thermal regulation in Lennox residential and commercial furnaces. This 140 170F AUTO Limit Switch functions as a primary safety mechanism, monitoring internal plenum temperatures to prevent heat exchanger damage or unsafe operating conditions. Engineered with a 170F cut out temperature and a 140F cut in temperature, this automatic reset limit switch ensures the