What causes a Lennox 18J28 limit switch to trip repeatedly

52" WC trigger point maintains the manufacturer's safety tolerances for flue gas venting

This unit is built to withstand the rigors of continuous operation in Lochinvar and A

it is compatible with equivalent Bryant and Payne outdoor condensing units that specify this part number or its predecessors

Lennox 51M75 Limit Switch 319825-402 What causes a Lennox 18J28The Lennox 51M75 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces and air handlers. This OEM Lennox replacement part operates with a fixed temperature range, featuring a 95 125F trip point with an automatic reset configuration. Engineered to monitor heat exchanger temperatures, the Lennox 51M75 prevents overheating by breaking the electrical circuit to the gas valve or blower motor if