OEM Carrier Gas Pressure Switch HK02LB008 for Model PG8MAA060090AFJA

This is the factory-specified OEM gas pressure switch for the Carrier PG8MAA060090AFJA packaged gas furnace. The pressure switch is a critical safety component that proves the draft inducer motor is running at the correct speed and generating sufficient negative pressure before allowing the ignition sequence to proceed. When this switch fails — or its sensing hose cracks — the furnace control board will lock out on a pressure switch fault, typically flashing a fault code before a single ignition attempt is ever made. Common symptoms include the inducer motor spinning normally but the furnace never advancing to ignition, or a repeated 3- or 4-flash error code on the IFC board.

• OEM Part Numbers: HK02LB008 (Gas/LP Pressure Switch) | HK06WC091 (Pressure Switch, High Fire) — both covered by this listing for the PG8MAA060090AFJA
• OEM vs Generic: Factory OEM switches are calibrated to the exact water column (W.C.) set-point for this furnace. Off-brand substitutes frequently deviate from the rated trip pressure, causing nuisance lockouts or — worse — allowing the furnace to fire without adequate venting, creating a carbon monoxide hazard.
• Install Difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and a manometer or magnehelic gauge to verify W.C. after installation. Always inspect the rubber sensing hose and condensate trap for blockages before replacing the switch itself.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PG8MAA060090AFJA packaged gas furnace unit. Also fits other Carrier, Bryant, and Payne models sharing the HK02LB008 / HK06WC091 pressure switch specification — verify your model's data plate and existing switch W.C. rating before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy. Order now and receive same-day shipping on in-stock inventory.