OEM Carrier Dual Pressure Switch Assembly HK06NB021 for Model PG96VAT66120DBAA

This OEM dual pressure switch assembly is the factory-specified replacement for the Carrier PG96VAT66120DBAA 96% AFUE gas furnace. The pressure switch is a critical safety component that monitors the inducer motor's draft vacuum to verify it is operating at the correct RPM and generating sufficient negative pressure for safe venting before allowing the ignition sequence to proceed. When either switch in the assembly fails, the furnace control board will lock out the heating cycle — leaving you with a no-heat fault before the igniter ever fires. Common symptoms include a short-cycling inducer with no ignition, a flashing fault code indicating an open pressure switch, or a furnace that restarts normally after a manual reset but locks out again within minutes.

• Part Number: HK06NB021 (superseded by HK06MB021) | Dual pressure switch assembly | Includes both switches, each with 2 wire terminals and 1 hose port | Factory-matched vacuum trip points for the PG96VAT66120DBAA
• OEM vs Generic: OEM pressure switches are calibrated to exact water-column (W.C.) specifications for this furnace's inducer and heat exchanger. Aftermarket units often carry wider tolerances, risking nuisance trips or, worse, failure to detect a true venting fault — a safety-critical difference on a 96% condensing furnace.
• Install Difficulty: 2/5 — Turn off gas and power at the disconnect before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer (recommended to verify W.C. at startup). Photograph all hose and wire routing before disconnecting. Inspect rubber hose ports for cracks while the assembly is out.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PG96VAT66120DBAA 96% two-stage gas furnace. Also cross-references alternate OEM part number BA20268-2. Verify your existing switch hose port count and wire terminal configuration against this listing before ordering. Our fitment team is available to confirm compatibility — reach out before you buy and we'll make sure this is the right part for your unit.