OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GNAA36090NA

This is the factory-specified OEM replacement draft inducer pressure switch for the Carrier PY3GNAA36090NA gas furnace. The pressure switch is a critical safety component that monitors the negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the furnace control board will lock out the heating cycle entirely — leaving you with a no-heat call and a flashing fault code indicating a pressure switch error. Common symptoms include the inducer motor running but the furnace never advancing to ignition, or repeated short-cycling with a pressure switch fault.

• Specs: 0.18" Water Column (WC) set point | SPST (Single-Pole, Single-Throw) | Negative pressure sensing | OEM part HK06WC061, superseded by HK06MB061 | Cross-references Honeywell IS20224-5236 / 1639D2/B
• OEM vs Generic: This OEM-equivalent switch is factory-calibrated to the exact 0.18" WC trip point required by your Carrier furnace. Off-brand switches with loose tolerances can trip too early or too late, causing nuisance lockouts or, worse, allowing the furnace to fire without confirmed venting.
• Install difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: 1/4" nut driver, flat-head screwdriver, and needle-nose pliers. Disconnect the hose and two wiring terminals, swap the switch, and reconnect. Always verify hose integrity for cracks while the panel is open.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Engineered for the Carrier PY3GNAA36090NA packaged gas/electric unit. Also fits select Bryant and Payne models sharing the same inducer assembly and 0.18" WC specification. Note: OEM part number HK06WC061 has been superseded — this listing ships the current authorized replacement HK06MB061, which is a direct drop-in. Verify your existing switch's WC rating on the label before ordering. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy.