OEM Carrier Inducer Draft Pressure Switch 0.18" WC for Model PY4GNAB60090NA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY4GNAB60090NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper draft before allowing the ignition sequence to proceed. When it fails or sticks open, the control board interprets it as a blocked flue or inducer fault — resulting in a no-heat lockout, repeated ignition attempts with no flame, or a fault code indicating a pressure switch error. Replacing this switch with the correct OEM part restores proper sequencing and safe operation.

• Specs: 0.18" W.C. (inches water column) set point | Draft/inducer proving type | Single-port | Normally open | OEM Part # HK06WC061 (superseded by HK06MB061) | Cross-reference: Honeywell IS20224-5236
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact 0.18" W.C. trip point required by the PY4GNAB60090NA control board. Generic substitutes frequently operate outside tolerance, causing nuisance lockouts or — worse — failing to detect a true blocked-flue condition, creating a safety risk.
• Install difficulty: 2/5 — Shut off gas and power before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, and a short length of silicone tubing. Photograph hose routing and wiring before disconnecting. Inspect inducer hose port and tubing for cracks or blockages while you have access.
• Warranty & Shipping: 1-year OEM manufacturer warranty against defects. Orders placed before cutoff ship same business day from our warehouse — back in heat fast.

Compatibility: Fits Carrier model PY4GNAB60090NA packaged unit. Also compatible with select Bryant and Payne models sharing the 0.18" W.C. pressure switch specification — verify the W.C. rating on your existing switch's label before ordering. Our parts specialists are available to confirm fitment before you buy.