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the flame sensor may be fouled with carbon or have a cracked insulator
and shuttering valves caused by mineral scale or mechanical wear
it is designed to snap into standard Modine control panel cutouts used in the 5H series applications
This model is foot-print compatible with most standard industry mounts
Lennox 66J78 Limit Switch Els PW 17895 the flame sensor may beExperienced HVAC contractors recognize the Lennox 66J78 Limit Switch as a critical safety component for maintaining furnace integrity and preventing heat exchanger damage. This OEM Lennox replacement part is a 36T series disc style control designed for High Limit or Secondary Rollout applications. It features a Normally Closed (NC) circuit that opens on temperature rise to interrupt the heating cycle if internal temperatures exceed safe operating