OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GNA048090AA (HK06WC061 / HK06MB061)

This OEM Carrier draft inducer pressure switch is the factory-specified replacement for the Carrier PY3GNA048090AA packaged gas unit. The pressure switch monitors negative pressure created by the inducer motor to confirm safe venting conditions before allowing the ignition sequence to proceed. When it fails or sticks open, the furnace will lock out before ever reaching the ignition stage — leaving you with a no-heat call and a blinking fault code indicating pressure switch failure.

• Specs: 0.18" Water Column (WC) set point | SPST normally open | Replaces OEM part HK06WC061 (superseded by HK06MB061) | Factory-matched trip point for precise inducer proving
• OEM vs Generic: OEM pressure switches are calibrated to the exact WC set point required by your unit's heat exchanger and flue design. Off-spec generic switches can trip too early or too late — causing nuisance lockouts or, worse, allowing combustion gases to linger.
• Install difficulty: 2/5 — Shut off gas and power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer (recommended for verification). Disconnect the hose barb and two spade terminals, swap the switch, and confirm operation on the next call for heat.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY3GNA048090AA packaged gas/electric unit. Also compatible with select Bryant and Payne models using the 0.18" WC SPST pressure switch specification. Verify the WC rating on your existing switch before ordering. Our team is available to confirm fitment — just reach out before you buy.