OEM Carrier Draft Pressure Switch 0.18" WC — HK06WC061 for Model PY3GEAA36090NA

This OEM draft-proving pressure switch is the factory-specified replacement for the Carrier PY3GEAA36090NA packaged gas unit. The pressure switch monitors negative pressure created by the inducer motor before allowing the ignition sequence to proceed. When it fails or sticks open, the control board cannot verify that combustion gases are safely venting — triggering a lockout before the burners ever light. Common symptoms include a furnace that attempts to start, runs the inducer, then shuts down with a pressure switch fault code (typically 2 flashes on Carrier systems).

• Specs: 0.18" W.C. (inches water column) setpoint | Single-port normally open | Honeywell OEM sensing element | Cross-reference: IS20224-5236, 1639D2/B | Successor part: HK06MB061
• OEM vs Generic: This OEM-spec switch is calibrated to the exact 0.18" W.C. trip point required by the PY3GEAA36090NA's combustion airflow design. Off-spec generic switches with loose tolerances can cause nuisance lockouts or, worse, allow ignition under unsafe venting conditions.
• Install difficulty: 2/5 — Always shut off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, digital manometer (recommended to verify inducer pressure post-install). Disconnect the rubber hose and two wire spade connectors, swap the switch, reconnect in reverse order, and test cycle the unit.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY3GEAA36090NA packaged gas/electric unit. Also cross-references for select Bryant and Payne models using the same 0.18" W.C. pressure switch specification — verify your unit's data plate and existing switch rating before ordering. Need fitment confirmation? Our HVAC parts team is standing by to verify your application before you buy.