OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GPAB48115NA

This is the factory-specified OEM draft (inducer) pressure switch for the Carrier PY4GPAB48115NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before the ignition sequence is allowed to begin. When it fails or sticks open, the control board cannot verify that the heat exchanger is safely vented — resulting in a no-heat lockout, a continuous inducer run with no ignition, or a fault code indicating an open pressure switch. OEM part number HK06WC061 has been superseded by HK06MB061 — both are factory-authorized and ship as the current production replacement.

• Specs: 0.18" W.C. (inches of water column) set point | Normally open (N.O.) configuration | Honeywell-manufactured switch body (IS20224-5236) | Single-port hose barb inlet | Factory-calibrated ±0.01" WC tolerance
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact W.C. rating required by your unit's inducer and heat exchanger design. Off-spec generic switches can trip prematurely or fail to trip at all — creating unsafe backdraft conditions or nuisance lockouts.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Disconnect the rubber hose from the port, unplug the two-terminal Molex connector, and unmount from the bracket. Tools needed: 1/4" nut driver, needle-nose pliers. Always inspect the hose for cracks or blockage before installing the new switch — a clogged hose is a leading cause of pressure switch failure.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY4GPAB48115NA packaged gas/electric unit. Cross-references: HK06WC061 (superseded), HK06MB061 (current), Honeywell IS20224-5236. Also fits select Bryant and Payne models — verify your unit's data plate W.C. rating before ordering. Our fitment team is available to confirm compatibility before you buy.