OEM Carrier Draft Pressure Switch 0.18" WC SPST for Model PY4GNAB60090AA

This OEM draft-proving pressure switch (part number HK06WC061, now superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GNAB60090AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm safe venting before allowing ignition to proceed. When it fails or sticks open, the control board cannot verify proper draft, causing the furnace to lock out before ignition — leaving you with no heat and a blinking fault code.

• Specs: 0.18" Water Column (WC) set point | SPST (Single-Pole Single-Throw) | Honeywell OEM cross IS20224-5236 | Factory-matched switching accuracy
• OEM vs Generic: This is a genuine OEM Carrier part meeting factory pressure tolerances. Off-brand switches frequently drift from their rated WC set point, causing nuisance lockouts or — worse — failing to detect blocked venting, creating a safety risk.
• Install difficulty: 2/5 — Power down the unit at the disconnect before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, manometer (recommended for verification). Remove the single hose barb connection and two wiring terminals, swap the switch, and re-verify draft pressure. Always check inducer wheel and vent path for blockage before condemning the switch.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GNAB60090AA packaged unit. OEM part HK06WC061 has been superseded by HK06MB061 — both part numbers are fulfilled with the current production replacement. Verify the WC rating on your unit's existing switch before ordering. Our fitment team is available to confirm compatibility before you buy.