Lennox 18J37 Limit Switch which is the standard for

which is the standard for Honeywell and Barber-Colman linkage kits

this is an auxiliary switch designed for pilot duty and control signals

If the vacuum is sufficient but the SPNO contact remains open

Maintains optimal product flow and prevents ice buildup on the evaporator assembly

Lennox 18J37 Limit Switch which is the standard forThe Lennox 18J37 Limit Switch is a critical safety component engineered for high performance thermal regulation in residential and light industrial furnaces. As a normally closed disc style limit control, this genuine OEM Lennox replacement part is specifically designed to prevent heat exchanger damage by interrupting the burner circuit if internal temperatures exceed safety thresholds. Featuring a yellow color coded sleeve for rapid field