OEM Carrier Pressure Switch with Bracket for Model GB3AAV048115ADJA — Part# HK06WC090

This is the factory OEM replacement pressure switch with mounting bracket for the Carrier GB3AAV048115ADJA gas furnace. The pressure switch monitors negative pressure created by the inducer draft motor to verify safe venting conditions before allowing ignition to proceed. When it fails or sticks open, the control board cannot confirm inducer operation and the furnace will lock out — typically displaying a fault code — before the ignition sequence ever begins. Common symptoms include a running inducer with no spark, repeated ignition lockouts, or a flashing LED fault code indicating a pressure switch fault.

• Specs: OEM-rated water column (W.C.) pressure setting factory-matched to GB3AAV048115ADJA | Includes pre-assembled mounting bracket | 1/4" female spade terminals | Single-port design
• OEM vs Generic: This OEM switch is calibrated to the exact W.C. threshold required by Carrier for this model. Aftermarket pressure switches often carry wider tolerance ratings that can cause nuisance lockouts or, worse, allow ignition under unsafe draft conditions — always use OEM on furnace safety controls.
• Install difficulty: 2/5 — Shut off gas and 120V power before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, and needle-nose pliers. Disconnect the rubber hose and two wire leads, unscrew the bracket, and reverse steps to install. Confirm hose is free of cracks or blockages before reinstalling.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier GB3AAV048115ADJA gas furnace. Always cross-reference part number HK06WC090 against your unit's data plate and wiring diagram to confirm fitment. If you have questions about compatibility, our HVAC parts specialists are available to verify fit before you order — no guesswork required.