the Lennox 18J28 Limit Switch is a primary diagnostic point

the HPO-1511 offers superior impact resistance compared to standard PVC alternatives

while a lower point may cause nuisance tripping during normal operation

The 1053017 typically refers to the knob itself

Compact Enclosure: Small form factor and removable mounting tab facilitate clean mounting in crowded electrical cabinets and motor starter boxes

York S1-025-27747-011 Rollout Switch Els PW 17895 the Lennox 18J28 Limit SwitchThe York S1 025 27747 011 Rollout Switch is a critical OEM replacement part designed for high performance gas furnace safety. Engineered to trigger at a 250 degree Fahrenheit open temperature, this manual reset rollout switch serves as a final line of defense against dangerous flame rollout conditions. When the internal sensor detects excessive ambient heat near the burner boxoften caused by a cracked heat exchanger, blocked flue, or insufficient