OEM Carrier Dual Pressure Switch HK06NB020 for Model PG95XAT48080BBAA

This OEM dual pressure switch assembly is the factory-specified replacement for the Carrier PG95XAT48080BBAA 95% AFUE gas furnace. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing ignition to proceed. When either switch fails — or when a hose, port, or diaphragm degrades — the control board detects an open circuit and locks out the furnace entirely, leaving you with a no-heat call and a blinking fault code. A dual pressure switch assembly replaces both the primary and secondary sensing switches simultaneously, ensuring accurate proving across all firing stages.

• OEM Part Numbers: HK06NB020 (original) | Current OEM replacement: HK06MB020 — -0.75" WC / -0.30" WC dual set-point | Factory-matched diaphragm tolerances
• OEM vs Generic: OEM switches use factory-calibrated diaphragms rated to exact water-column specs. Generic aftermarket units often carry ±15% W.C. tolerances, risking nuisance lockouts or — more dangerously — failure to detect a true venting fault.
• Install Difficulty: 2/5 — Power down and lock out furnace before starting. Tools needed: 1/4" nut driver, flat-head screwdriver, needle-nose pliers. Photograph all hose connections before removal. Inspect rubber hoses and drain ports for clogs or cracks while switch is out.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PG95XAT48080BBAA 80,000 BTU, 95% AFUE two-stage gas furnace. Original part number HK06NB020 has been superseded by OEM replacement HK06MB020 — both are covered by this listing. Verify water-column ratings on your existing switch's data label before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — order with confidence and get it shipped today.