Lennox 15P85 Pressure Switch 318423-701 preventing motor burnout without requiring

preventing motor burnout without requiring manual reset

Audible humming or excessive heat often indicates an overloaded HVAC transformer or a partial short in the secondary circuit

Indicators include audible bearing noise from the drive

Operating at a nominal 575 VAC

Directional Rotation: Verified CW rotation matches Reznor replacement parts standards for specific series

Lennox 15P85 Pressure Switch 318423-701 preventing motor burnout without requiringThe Lennox 15P85 Pressure Switch is a critical safety component designed for precise combustion air pressure monitoring in HVAC systems. Specifically calibrated with a 0. 55" WC set point (Water Column), this OEM replacement part (also identified by part number 105078 01 and 101859 07) ensures that the inducer motor is generating sufficient draft before allowing the ignition sequence to proceed. Engineered for reliability in Lennox gas furnaces, this