OEM Carrier Pressure Switch -0.33 WC with Bracket (HK06WC090) for Model PG8UAA066111ACJA

This is the genuine OEM replacement pressure switch for the Carrier PG8UAA066111ACJA gas furnace. The pressure switch is a critical safety component that monitors negative air pressure created by the induced draft blower — it must close before the control board will allow ignition to proceed. When this switch fails or becomes stuck open, the furnace will lock out on a pressure switch fault, typically displaying a fault code and refusing to light. Common symptoms include a furnace that starts the inducer motor but never advances to ignition, or a unit that short-cycles immediately after the inducer energizes.

• Specs: -0.33" W.C. (inches water column) setpoint | SPST (Single-Pole, Single-Throw) | Includes factory mounting bracket | OEM part number HK06WC090
• OEM vs Generic: This is a genuine Carrier OEM pressure switch calibrated to the exact -0.33" W.C. specification required by the PG8UAA066111ACJA. Generic aftermarket switches often carry wider pressure tolerances, risking nuisance lockouts or — more critically — failing to detect true venting blockages, which is a safety hazard.
• Install Difficulty: 2/5 — Moderate DIY. Turn off gas and 120V power before servicing. Tools needed: Phillips screwdriver, 1/4" nut driver, needle-nose pliers. Disconnect the rubber hose and two wiring terminals, unbolt the old bracket, and reverse the process. Inspect the rubber hose for cracks or moisture blockage before installing the new switch.
• Warranty: 1-year OEM manufacturer warranty from date of purchase. In-stock orders ship same business day when placed by 5 PM local time.

Compatibility: Designed for the Carrier PG8UAA066111ACJA gas furnace. Also supersedes legacy Carrier part numbers including HK06WC088, HK06WC086, HK06WC076, HK06WC072, HK06WC073, HK06WC074, HK660001, 310315-751, 310315-752, and 326750-751. Always verify your unit's wiring diagram and existing switch W.C. rating against your data plate before ordering. Our parts specialists are available to confirm fitment — just reach out before you order.