OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GEAB48090NA

This OEM draft inducer pressure switch is the factory-specified replacement for the Carrier PY4GEAB48090NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to verify proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot confirm safe draft conditions — resulting in a no-heat lockout, a blinking fault code, or a system that attempts ignition repeatedly without firing.

• Specs: 0.18" Water Column (WC) set point | SPST (Single Pole, Single Throw) | Normally open | OEM part HK06WC061, superseded by HK06MB061 | Replaces Honeywell IS20224-5236
• OEM vs Generic: OEM pressure switches are calibrated to exact water column tolerances at the factory. Generic aftermarket units can drift ±0.05" WC or more, causing nuisance lockouts or — more dangerously — allowing ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Shut off power and gas before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (for verification). Photograph hose and wiring connections before disconnecting. Verify hose for cracks or blockage before blaming the switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct OEM replacement for Carrier PY4GEAB48090NA packaged units. Also fits select Bryant and Payne models sharing this 0.18" WC draft pressure switch specification — confirm your unit's data plate and existing switch rating before ordering. Questions about fitment? Our HVAC parts team verifies compatibility before you buy — order today and ship today.