OEM Carrier LP Gas Pressure Switch for Model PG8JAA048110AEJA — HK02LB008 / HK06WC091

This is the factory OEM gas pressure switch for the Carrier PG8JAA048110AEJA packaged gas unit. The pressure switch is a critical safety device that monitors the negative pressure produced by the inducer motor to confirm proper combustion airflow before allowing the gas valve to open. When this switch fails — or its sensing hose cracks — the furnace will lockout before ignition, leaving you with a no-heat call and a flashing fault code. Common failure symptoms include the inducer running continuously with no ignition attempt, or intermittent no-heat on cold starts.

• OEM Part Numbers: Primary — HK02LB008 (Gas Pressure Switch, LP) | Cross-reference — HK06WC091 (Pressure Switch). Both numbers are factory Carrier designations for this application.
• OEM vs Generic: This is a genuine Carrier OEM pressure switch, manufactured to exact W.C. (water column) trip-point specifications. Aftermarket substitutes frequently carry loose tolerances that can cause nuisance lockouts or — more dangerously — allow ignition with insufficient draft, creating a carbon monoxide risk.
• Install Difficulty: 3/5 — Always disconnect power before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, a manometer (to verify W.C. rating after install), and a flashlight. Inspect the rubber sensing hose for cracks before condemning the switch — a collapsed hose is a common root cause.
• Warranty & Shipping: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PG8JAA048110AEJA packaged gas heating unit. Note: HK02LB008 has been superseded — our inventory includes current factory stock. Verify the W.C. rating on your unit's existing switch and data plate before ordering. Not sure about fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork.