OEM Carrier Pressure Switch Assembly w/Bracket for Model PG8MAA042090ABJA — Part# HK06WC069

This is the genuine OEM Carrier pressure switch assembly (with mounting bracket) for the Carrier PG8MAA042090ABJA gas furnace. The pressure switch is a critical safety device that monitors negative pressure created by the inducer motor during the pre-purge cycle. If the switch fails to close — or fails to open — the integrated furnace control board will lock out ignition and prevent the burners from firing. Common symptoms of a failed pressure switch include a furnace that attempts to start but immediately shuts down, a continuous inducer motor run with no ignition, or a fault code indicating a pressure switch error on the control board.

• Specs: -3" W.C. (inches water column) rating | SPST (Single-Pole, Single-Throw) | Normally Open | Includes factory mounting bracket | Compatible with Factory Authorized Parts (FAP) program
• OEM vs Generic: This factory OEM part is manufactured to exact Carrier pressure tolerances (±0.05" W.C.). Generic aftermarket switches often ship with looser calibration tolerances, which can cause nuisance lockouts or — more dangerously — allow the furnace to fire under inadequate draft conditions.
• Install difficulty: 2/5 — Power down the furnace and confirm inducer motor health before replacing. Tools needed: 1/4" nut driver, flathead screwdriver, and a manometer or magnehelic gauge to verify draft pressure. Disconnect the rubber hose, spade terminals, and two bracket screws. Reconnect in reverse order. Always clear fault codes after replacement.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed and factory-specified for the Carrier PG8MAA042090ABJA gas furnace. Verify the -3" W.C. rating and SPST configuration against your unit's wiring diagram before ordering. Not sure if this is your part? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.