OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GPAA60115AA

This is the factory-specified OEM draft pressure proving switch for the Carrier PY4GPAA60115AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor during the pre-purge cycle. If the switch fails to close — or fails to open — the integrated furnace control board will lock out ignition, leaving you with no heat. Common symptoms include a furnace that starts the inducer but never advances to ignition, or a system that throws a pressure switch fault code on the control board.

• Specs: 0.18" W.C. (inches water column) set point | Normally open (N.O.) | Single-port sensing | Replaces OEM part number HK06WC061 (superseded by HK06MB061) | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: This OEM-grade switch is factory-calibrated to the exact 0.18" W.C. set point required by the Carrier PY4GPAA60115AA control sequence. Off-tolerance generic switches can cause nuisance lockouts or — worse — allow ignition during inadequate venting conditions.
• Install difficulty: 2/5 — Disconnect power before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer or magnehelic gauge to verify set point after installation. Inspect rubber sensing hose for cracks before reusing.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY4GPAA60115AA packaged unit. Also fits compatible Bryant and Payne models sharing the HK06WC061 / HK06MB061 specification — always confirm the 0.18" W.C. rating on your unit's existing switch before ordering. In stock and ready to ship today — contact our parts team for fitment verification.