OEM Carrier Gas Pressure Switch HK02LB008 / HK06WC091 for Model PG8MAA066135AFJA

This OEM gas pressure switch is the factory-specified replacement for the Carrier PG8MAA066135AFJA packaged gas furnace. The pressure switch is a critical safety component that monitors the negative pressure (vacuum) created by the draft inducer motor. If the inducer fails to establish proper airflow, the switch remains open and locks out the ignition sequence — protecting the heat exchanger and preventing unsafe flue gas conditions. When this switch fails, the furnace will typically begin the startup sequence, the inducer will spin up, but the unit will lock out before the gas valve opens and the burners ignite.

• OEM Part Numbers: HK02LB008 (Gas Pressure Switch, LP-rated, 6.5" W.C. cutout) | HK06WC091 (SPST Pressure Switch, High Fire) — both are factory-authorized Carrier parts covered by this listing
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. (water column) setpoints at the factory. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — worse — unsafe operation. Always match the W.C. rating stamped on the original switch body before ordering.
• Install Difficulty: 2/5 — Power down and lock out the unit before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, 5/16" nut driver, and a digital manometer to verify inducer vacuum after installation. Always inspect the pressure switch hose for cracks or blockages before condemning the switch itself — a clogged hose is a common misdiagnosis.
• Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from our warehouse. Fits Carrier, Bryant, and Payne units sharing this platform.

Compatibility: Engineered for the Carrier PG8MAA066135AFJA packaged gas furnace. Also fits select Bryant and Payne models using OEM part numbers HK02LB008 or HK06WC091. Verify the W.C. rating and part number on your existing switch before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork, no return hassle.