OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GNAA48090AA

This OEM Carrier draft inducer pressure switch (part HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GNAA48090AA packaged gas/electric unit. The pressure switch monitors negative pressure created by the inducer blower to confirm safe draft before allowing the ignition sequence to proceed. When this switch fails, the control board cannot verify that combustion gases are being properly vented, triggering a safety lockout — the most common symptom being a furnace or packaged unit that attempts to start but shuts down before the burners ever ignite.

• Specs: 0.18" Water Column (WC) set point | SPST configuration | Normally open | Factory-matched Honeywell IS20224-5236 equivalent | OEM part HK06WC061 superseded by HK06MB061
• OEM vs Generic: OEM pressure switches are calibrated to exact WC tolerances at the factory. Aftermarket switches frequently drift ±0.05" WC or more, causing nuisance lockouts or — more dangerously — allowing ignition under improper draft conditions. Always use OEM on gas-fired equipment.
• Install difficulty: 2/5 — Turn off power and gas before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of 3/16" ID replacement tubing (recommended). Locate the switch on the inducer housing, swap the hose and two wire leads, and restore power. Always inspect the hose for cracks before reinstalling.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PY4GNAA48090AA packaged unit. This switch is also used across a wide range of Carrier, Bryant, and Payne packaged and split-system equipment sharing the same inducer and draft configuration. Verify the 0.18" WC rating on your existing switch before ordering. Our fitment team is available to confirm compatibility — just reach out before you buy.