OEM Carrier Gas Pressure Switch HK02LB008 for Model PG8JAA060090AFJA

This OEM gas pressure switch (part numbers HK02LB008 and HK06WC091) is the factory-specified replacement for the Carrier PG8JAA060090AFJA 80% AFUE gas furnace. The pressure switch is a critical safety device that monitors the negative pressure (vacuum) produced by the draft inducer motor. It confirms the inducer is running at the correct speed and that the flue path is clear before allowing the ignition sequence to proceed. When this switch fails — or its sensing port, hose, or port becomes blocked — the furnace control board will lock out before ignition, resulting in a no-heat call with no visible error or a pressure switch fault code.

• OEM Part Numbers: Primary — HK02LB008 (Gas Pressure Switch) | Cross-reference — HK06WC091 (Pressure Switch, High Fire) | Factory-authorized Honeywell-manufactured switch
• OEM vs Generic: This is a genuine Carrier OEM pressure switch, factory-calibrated to the exact water column (W.C.) setpoint required by the PG8JAA060090AFJA. Aftermarket substitutes may carry wider W.C. tolerances, risking nuisance trips or, worse, a failed-open fault that bypasses the safety function.
• Install Difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a digital manometer (recommended to verify W.C. after replacement). Note the orientation and port assignment of the sensing hose before disconnecting. Inspect the rubber hose and drain port for blockage or cracks while the switch is out.
• Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG8JAA060090AFJA 80% AFUE single-stage gas furnace. Always cross-reference the W.C. rating stamped on your existing switch and verify against the OEM part number on your unit's wiring diagram before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before your order ships.