OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GNAA36060NA

This OEM draft-proving pressure switch is the factory-specified replacement for the Carrier PY3GNAA36060NA packaged unit. The pressure switch monitors negative pressure created by the inducer (draft) motor to confirm that the heat exchanger flue path is clear before allowing the ignition sequence to proceed. When the switch fails or its sensing hose cracks, the control board detects an open-circuit condition and locks out the system — resulting in a no-heat call with no ignition attempt, often accompanied by a diagnostic fault code indicating a pressure switch failure.

• Specs: 0.18" W.C. (water column) set point | SPST normally open | Manufactured by Honeywell (IS20224-5236) | Factory Authorized Carrier Part | OEM Part# HK06WC061 (superseded by HK06MB061)
• OEM vs Generic: This is a genuine Factory Authorized Part, manufactured to exact Carrier set-point tolerances. Generic pressure switches often carry ±10–15% set-point variance, which can cause nuisance lockouts or — more critically — allow operation under unsafe draft conditions.
• Install difficulty: 2/5 — Turn off power and gas to the unit before starting. Tools needed: 1/4" nut driver, flathead screwdriver, and needle-nose pliers. Disconnect the wire harness and pressure sensing hose, swap the switch, and reconnect. Always inspect the rubber sensing hose for cracks or blockages before reinstalling.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY3GNAA36060NA packaged unit. Note that OEM part number HK06WC061 has been superseded by HK06MB061 — both are the correct 0.18" W.C. replacement for this model. Also fits select Bryant and Payne models using the same switch specification. Verify the W.C. rating on your existing switch before ordering. Our parts specialists are available to confirm fitment — order today and ship today.