OEM Carrier Furnace Draft Pressure Switch 0.18 WC for Model PY4GPAB60130NA91D

This OEM draft inducer pressure switch is the factory-specified replacement for the Carrier PY4GPAB60130NA91D packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm adequate airflow before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify safe venting conditions — resulting in a hard lockout before the burners ever fire. Common symptoms include a furnace that attempts to start but shuts down immediately, a flashing diagnostic fault code for pressure switch open, or an inducer that runs continuously with no ignition.

• Specs: 0.18" W.C. (water column) set point | SPST normally-open configuration | Factory-matched Honeywell sensing element | Cross-references: HK06WC061, HK06MB061, IS20224-5236, 1639D2/B
• OEM vs Generic: This is a genuine Carrier OEM part manufactured to exact factory pressure tolerances. Aftermarket pressure switches often deviate from rated W.C. thresholds, causing nuisance lockouts or — more dangerously — allowing ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Power down the unit at the disconnect and thermostat before beginning. Tools needed: 1/4" and 5/16" nut drivers, flathead screwdriver, manometer (recommended for W.C. verification). Photograph all tubing connections before removal. Replace inducer port tubing if cracked or brittle.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY4GPAB60130NA91D packaged unit. Also fits select Bryant and Payne models sharing the 0.18" W.C. pressure switch specification. Always verify the W.C. rating stamped on your existing switch before ordering — mismatched ratings will cause repeated lockouts. Note: OEM part number HK06WC061 has been superseded by HK06MB061; both are covered by this listing. Questions? Our HVAC parts specialists confirm fitment before you order.