Technicians typically observe intermittent "No Flame" lockouts

The vertical mounting requirement optimizes the diaphragm movement

Common Inquiries

providing a drop-in OEM HVAC replacement part solution that maintains the original equipment's safety UL certification and wiring integrity

making it suitable for demanding mechanical rooms where protection against dust and water is required

Lennox 65W90 Temp Switch 319852-301 Technicians typically observe intermittent "NoIf you are seeing excessive ice buildup on the outdoor coil or the heat pump is failing to initiate its defrost cycle during low ambient conditions, it is likely time to replace the Lennox 65W90 Defrost Temperature Switch. As an OEM Lennox 102298 01 replacement, this defrost sensor is engineered specifically for Lennox heat pump and AC units to monitor the refrigerant temperature at the distributor or liquid line. When the coil temperature drops below