OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GNA042060NA

This is the factory-specified OEM draft pressure switch (part number HK06WC061, superseded by HK06MB061) for the Carrier PY3GNA042060NA packaged gas/electric unit. The pressure switch monitors negative pressure produced by the draft inducer motor before each ignition cycle. If the inducer fails to generate sufficient airflow — or the switch itself fails — the furnace control board will lock out on a pressure fault, preventing any attempt at ignition and leaving you with no heat. Symptoms include a short-cycling inducer, a flashing diagnostic fault code, or a furnace that runs the inducer but never advances to ignition.

• Specs: 0.18" Water Column (WC) set point | Normally open, closes on negative pressure | Honeywell/Resideo manufactured | Cross-references: IS20224-5236, 1938D2/B | Superseded OEM part: HK06MB061
• OEM vs Generic: This OEM switch is factory-calibrated to the exact 0.18" WC trip point required by the Carrier PY3GNA042060NA control board. Generic switches frequently carry ±15% tolerance, which can cause nuisance lockouts or — worse — allow ignition attempts under unsafe draft conditions.
• Install difficulty: 2/5 — Disconnect power before starting. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer or magnehelic gauge to verify post-install set point. Photograph hose routing and terminal wiring before removal. Replace pressure tubing if cracked or brittle.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PY3GNA042060NA packaged gas/electric unit. Also fits select Bryant and Payne models requiring a 0.18" WC draft pressure switch — verify your unit's data plate and existing switch markings before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase.