OEM Carrier Furnace Draft Pressure Switch 0.18" W.C. for Model PY3GNAA48115NA

This is the OEM factory-specified draft inducer pressure switch for the Carrier PY3GNAA48115NA packaged gas unit. The pressure switch monitors negative pressure created by the inducer blower to confirm safe venting conditions before allowing ignition to proceed. When this switch fails or sticks open, the furnace will lock out during the inducer proving stage — typically before any spark or ignition attempt — leaving you with no heat. A failed pressure switch is one of the most common causes of furnace "lockout" fault codes.

• Specs: 0.18" W.C. (water column) set point | Normally open | Single-port draft proving switch | Honeywell-manufactured (IS20224-5236 / 1938D2/B) | OEM part HK06WC061, superseded by HK06MB061
• OEM vs Generic: This OEM switch is calibrated to the exact 0.18" W.C. factory set point. Generic switches often carry wider tolerances, risking nuisance lockouts or — more dangerously — allowing ignition under unsafe venting conditions.
• Install Difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (for continuity verification). Label or photograph tubing connections before removal. Replace inducer hose if cracked or brittle while you have access.
• Warranty & Shipping: Backed by a 1-year OEM parts warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3GNAA48115NA packaged gas/electric unit. Also fits select Bryant and Payne models sharing the same inducer assembly. Always verify the 0.18" W.C. rating on your existing switch or unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy.