OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GNAB48115AA (HK06WC061)

This OEM Carrier draft inducer pressure switch is the factory-specified replacement for the Carrier PY4GNAB48115AA packaged unit. The pressure switch monitors negative pressure created by the inducer blower to confirm safe venting conditions before allowing ignition to proceed. When this switch fails or sticks open, the control board cannot verify that combustion gases are being properly exhausted — resulting in a no-heat lockout, a blinking fault code, or a system that attempts ignition and immediately shuts down without ever firing.

• Specs: 0.18" W.C. (water column) set point | SPST normally-open configuration | Replaces OEM part numbers HK06WC061 and updated supersession HK06MB061 | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: This is the genuine factory OEM switch, calibrated to the exact 0.18" W.C. set point required by this model. Aftermarket switches often drift in calibration, causing nuisance lockouts or — worse — failing to detect a true venting blockage, creating a safety hazard.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, and a manometer to verify inducer pressure post-install. Photograph all hose and wire connections before removal.
• Warranty: 1-year OEM factory warranty coverage. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY4GNAB48115AA packaged unit and other Carrier, Bryant, and Payne models requiring a 0.18" W.C. draft pressure switch. Always verify the W.C. rating stamped on your existing switch before ordering. Need fitment help? Our HVAC specialists confirm compatibility before you buy — no guesswork required.