OEM Carrier Pressure Switch w/ Bracket -0.33" W.C. for Model PG8UAA036065AAJA

This OEM pressure switch (part #HK06WC090) is the factory-specified replacement for the Carrier PG8UAA036065AAJA packaged gas furnace. The pressure switch monitors negative pressure generated by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When it fails or sticks open, the control board cannot verify that the flue is drafting correctly — causing the furnace to lock out before ignition, leaving you with no heat. Common symptoms include a blinking fault code indicating a pressure switch error, an inducer motor that runs continuously without advancing the heat cycle, or a furnace that starts briefly then shuts down.

• Specs: -0.33" W.C. (inches water column) trip point | Includes factory mounting bracket | Single-port hose connection | 24V control circuit compatible
• OEM vs Generic: This is a genuine Carrier OEM part — factory-calibrated to the exact W.C. rating required by the PG8UAA036065AAJA. Off-brand pressure switches frequently carry ±10–15% W.C. tolerances, risking nuisance lockouts or, worse, failing to detect a true venting fault.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and a short length of replacement hose (optional). Photograph the hose routing and wire connections before removal. Confirm the inducer hose and port are free of moisture or debris prior to installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Confirmed fit for Carrier model PG8UAA036065AAJA packaged gas furnace. Also supersedes earlier pressure switch part numbers HK06WC088, HK06WC086, HK06WC076, HK06WC074, HK06WC073, HK06WC072, HK660001, 326750-751, 310315-751, and 310315-752. Always verify the W.C. rating on your existing switch's label before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy.