OEM Carrier LP Gas Pressure Switch HK02LB008 / HK06WC091 for Model PG8JAA048090AEJA

This OEM Carrier LP gas pressure switch is the factory-specified replacement for the Carrier PG8JAA048090AEJA packaged gas unit. The pressure switch is a critical safety component that monitors inducer motor operation — it proves the draft inducer is running at the correct RPM and generating sufficient negative pressure before allowing the gas valve to open and ignition to occur. When this switch fails or sticks open, the furnace will lock out before ignition, resulting in a no-heat call. A failed switch often triggers a diagnostic fault code on the control board and may cause the system to cycle the inducer repeatedly without ever reaching the ignition stage.

• Part Numbers: Primary OEM Part # HK02LB008 (LP Gas Pressure Switch, 6.5" WC cut-out) | Secondary OEM Part # HK06WC091 (SPST High Fire Pressure Switch) | Note: HK02LB008 is superseded by HK02MB008; HK06WC091 is superseded by HK06MC110 — all cross-references ship as the current authorized replacement.
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. (water column) ratings at the factory. Aftermarket switches are frequently mis-rated by ±0.10" WC or more, causing nuisance lockouts in cold weather or — worse — allowing unsafe inducer conditions to go undetected. Trust OEM specs for a safety-critical part.
• Install Difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a digital manometer to verify W.C. after installation. Disconnect the rubber hose port carefully — old hoses may be brittle. Photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PG8JAA048090AEJA packaged gas unit. This switch is also used across Bryant and Payne equipment sharing the same platform — verify your unit's data plate W.C. rating before ordering. Suitable for LP gas, natural gas, and air applications; mountable in horizontal or vertical orientation. Questions about fitment? Our HVAC-specialist team confirms compatibility before you order — call or chat today.