OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GNAA48060AA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY4GNAA48060AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm adequate venting before the control board allows ignition to proceed. When this switch fails or sticks open, the system will lock out before ignition — resulting in a no-heat call with the inducer running but no spark or gas flow. It may also cause continuous retry lockout codes on the control board.

• Specs: 0.18" W.C. (water column) setpoint | SPNO (single-pole, normally open) | Replaces OEM part HK06WC061 and Honeywell IS20224-5236 | Also superseded by HK06MB061
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact W.C. ratings. Generic alternatives may have ±10–15% tolerance drift, causing nuisance lockouts or — worse — failing to prove unsafe venting conditions.
• Install difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, and manometer (optional for verification). Photograph existing hose routing before removing the old switch; incorrect hose routing is the #1 installation error.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GNAA48060AA packaged unit. Also crosses to compatible Bryant and Payne models sharing the 0.18" W.C. draft pressure switch specification. Always verify your unit's wiring diagram and existing switch W.C. rating before ordering. Our fitment team is available to confirm compatibility before you buy.