OEM Carrier Pressure Switch with Bracket for Model GB1AAV048135ADJA — Part# HK06WC090

This OEM pressure switch with factory-installed bracket is the direct replacement for the Carrier GB1AAV048135ADJA gas furnace. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails, the furnace will lock out before ignition — often displaying a fault code indicating an open pressure switch — even when the inducer motor is running normally. A faulty switch can also cause short-cycling or a furnace that attempts ignition repeatedly without success.

• Specs: OEM-rated water column (W.C.) pressure setting | Includes factory-mounted bracket for direct drop-in installation | Single-port or dual-port hose connection (verify at unit) | 24V control circuit compatible
• OEM vs Generic: This is a genuine OEM Carrier part (HK06WC090), factory-calibrated to the exact W.C. rating required by the GB1AAV048135ADJA. Aftermarket switches often carry imprecise ratings that can cause nuisance lockouts or, worse, allow combustion without confirmed venting — a safety risk.
• Install difficulty: 2/5 — Turn off gas supply and power at the disconnect before servicing. Tools needed: flathead screwdriver, needle-nose pliers, and a manometer if verifying W.C. rating post-install. Disconnect the hose port(s) and 24V wire leads, unmount the old bracket, and snap the new assembly into position.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier GB1AAV048135ADJA gas furnace. Always confirm the W.C. rating on your existing switch and the unit's data plate before ordering to ensure proper calibration match. Our fitment team is available to verify compatibility before you buy — no guesswork required.