Lennox 33J88 Pressure Switch 30067439-890 It indicates a "Close on"

It indicates a "Close on" (automatic) reset logic where the switch opens at 150°F and closes automatically when the temperature cools

including 30HXA

Why is it necessary to use an OEM bonnet gasket instead of a generic alternative

this coil prevents valve sticking and maintains precise system pressure regulation

Complete Field Service Set: Includes two ring packs (U-cup with installed O-ring)

Lennox 33J88 Pressure Switch 30067439-890 It indicates a "Close on"The Lennox 33J88 Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency gas furnaces. Rated for a set point of 4. 50" WC, this SPST (Single Pole Single Throw) switch provides reliable circuit closure to the control board once the inducer motor establishes the required negative pressure. This part is a direct factory replacement for Lennox model 33J8801, ensuring a drop in fit with existing mounting