OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GPAA48090AA

This OEM draft inducer pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY3GPAA48090AA packaged gas unit. The pressure switch monitors negative pressure created by the draft inducer motor to confirm safe flue-gas venting before allowing the ignition sequence to proceed. When this switch fails, the furnace or packaged unit will lock out before ignition — often displaying a pressure-switch fault code — leaving you with no heat despite the inducer running normally.

• Specs: 0.18" Water Column (WC) set point | Normally open (N.O.) configuration | Spade terminal connections | Factory-calibrated for precise draft proving | OEM Part: HK06WC061 / Superseded by HK06MB061
• OEM vs Generic: This is a genuine Carrier factory-authorized part, manufactured to exact WC tolerance. Generic switches often carry wider tolerance margins, risking nuisance lockouts or — more dangerously — failing to detect a true venting failure.
• Install difficulty: 2/5 — Shut off gas and power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer to verify draft pressure post-install. Photograph existing hose and wire connections before removing the old switch. Always check the inducer hose and port for blockage before replacing the switch.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3GPAA48090AA packaged gas/electric unit and also fits a range of Carrier, Bryant, and Payne furnaces, packaged units, RTUs, heat pumps, and air handlers requiring a 0.18" WC draft pressure switch. Verify your existing switch's WC rating on the data plate or switch label before ordering. Have fitment questions? Our HVAC parts specialists confirm compatibility before you buy — contact us anytime.