OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GNA048115AA

This is the factory OEM draft pressure proving switch for the Carrier PY3GNA048115AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the gas valve to open. When it fails or gets stuck open, the furnace control board detects a venting fault and locks out ignition entirely — leaving you with a system that runs the inducer but never advances to heat. Common symptoms include a flashing fault code for "pressure switch open" or the unit cycling the inducer repeatedly without lighting the burner.

• Specs: 0.18" W.C. (water column) rated | SPST normally open | Replaces OEM part HK06WC061 / current supersede HK06MB061 | Cross-references Honeywell IS20224-5236
• OEM vs Generic: This OEM switch is factory-calibrated to the exact 0.18" W.C. set point required by the Carrier PY3GNA048115AA. Generic substitutes often carry wider trip-point tolerances, risking nuisance lockouts or — more dangerously — failure to detect a true venting problem.
• Install Difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and needle-nose pliers for hose barb removal. Inspect the rubber pressure hose for cracks or blockages before installing; a clogged hose is a frequent root cause of switch failure. Photograph the hose routing before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY3GNA048115AA. Also fits applicable Bryant and Payne models sharing this pressure switch specification — verify the 0.18" W.C. rating on your existing switch or unit data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy.