OEM Carrier Gas Pressure Switch HK02LB008 / HK06WC091 for Model PG8JAA066135AFJA

This is the OEM factory-specified gas pressure switch for the Carrier PG8JAA066135AFJA packaged gas furnace unit. The pressure switch is a critical safety component that monitors inducer motor operation by detecting the negative pressure (vacuum) created in the flue system. When the inducer fails to reach the correct RPM — or a hose, port, or diaphragm fails — the pressure switch will not close, preventing ignition and locking out the furnace to protect against unsafe flue conditions. Common symptoms of a failed pressure switch include a furnace that attempts to start and immediately locks out, an inducer that runs but heating never begins, or a blinking fault code indicating a pressure switch fault on the control board.

• OEM Part Numbers: HK02LB008 (Gas Pressure Switch) | HK06WC091 (Pressure Switch, High Fire) — both factory-authorized Carrier/Honeywell parts for this unit
• Specs: Cut-out setpoint: 6.5" w.c. | SPST configuration | Compatible with natural gas and LP gas applications | Horizontal or vertical mounting | Replaces superseded part numbers HK02MB008 and HK06MC110
• OEM vs Generic: OEM pressure switches are calibrated to exact factory water-column tolerances. Off-brand alternatives often carry ±15% setpoint variance, which can cause nuisance lockouts or — more dangerously — allow the furnace to fire under unsafe draft conditions.
• Install Difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended for setpoint verification). Always inspect rubber hose connections and condensate ports before condemning the switch — a blocked port mimics switch failure. Photograph wiring before disconnecting.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed and factory-matched for the Carrier PG8JAA066135AFJA packaged gas furnace. Also fits a broad range of Carrier, Bryant, and Payne furnaces and packaged units that reference HK02LB008 or HK06WC091 — verify your unit's data plate and existing switch markings before ordering. Not sure? Our team confirms fitment before you buy.