OEM Carrier LP Gas Pressure Switch for Model PG8JAA036070AGJA

This is the factory OEM replacement LP gas pressure switch for the Carrier PG8JAA036070AGJA packaged gas unit. The pressure switch is a critical safety and sequencing component — it monitors the pressure differential produced by the inducer (draft) motor and proves the combustion airflow path is clear before allowing the gas valve to open. When this switch fails or sticks, the furnace will attempt a call for heat, run the inducer, and then lock out without ever reaching the ignition stage. Fault codes for a failed pressure switch typically appear as a 3-flash or pressure switch open/stuck sequence on the control board LED.

• OEM Part Numbers: Primary — HK02LB008 (Gas Pressure Switch) | Related — HK06WC091 (Pressure Switch) | HK06WC100 (Pressure Switch w/ Bracket). Verify your specific variant against your unit's wiring diagram before ordering.
• Specs: LP (propane) gas pressure switch | Cut-out pressure: 6.5" W.C. (inches water column) | Factory-matched pressure rating | SPST normally-open configuration | OEM cross-reference: GFS3451-4036
• OEM vs Generic: This is a genuine Carrier factory-authorized part, manufactured to exact pressure tolerances. Aftermarket switches often carry ±10–15% pressure variance, which can cause nuisance lockouts or — worse — unsafe ignition sequences. Don't compromise on safety-critical components.
• Install Difficulty: 2/5 — Shut off gas supply and 120V power before starting. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify W.C. after install). Disconnect the two wire leads and one rubber hose, swap the switch, and reconnect. Always confirm the inducer motor is functioning correctly before condemning the switch alone.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for the Carrier PG8JAA036070AGJA packaged gas heating unit. Also fits select Bryant and Payne models sharing this pressure switch specification — confirm part number match on your unit's data plate or wiring schematic. Have a fitment question? Our HVAC parts specialists verify compatibility before you order. Order now — in stock and ships today.