OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GNAB30060AA

This OEM draft-proving pressure switch is the factory-specified replacement for the Carrier PY4GNAB30060AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm that the flue is clear and venting properly before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify inducer operation and the furnace will lock out — typically before the igniter ever energizes. Common symptoms include a no-heat call with the inducer running but the igniter never glowing, or a fault code indicating a pressure switch error.

• Specs: 0.18" Water Column (WC) rating | SPST (Single-Pole, Single-Throw) | Normally open | OEM Part # HK06WC061 (superseded by HK06MB061) | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact 0.18" WC trip point required by the Carrier PY4GNAB30060AA. Generic alternatives often carry wider pressure tolerances, risking nuisance lockouts or — more dangerously — failure to detect a true blocked-flue condition.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: flathead screwdriver, 1/4" nut driver, hose pick or small pick tool for tubing removal. Label or photograph all tubing connections before disconnecting. Test with a manometer if nuisance trips persist after replacement.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for Carrier PY4GNAB30060AA packaged units. This part also fits a wide range of Carrier, Bryant, and Payne HVAC equipment sharing the 0.18" WC pressure switch specification — verify your unit's existing switch rating against your data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat today.