OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GNA030060NA (HK06WC061 / HK06MB061)

This OEM draft-proving pressure switch is the factory-specified replacement for the Carrier PY3GNA030060NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When it fails or sticks open, the control board never receives the "all clear" signal — resulting in a no-heat lockout, repeated ignition attempts with no fire, or an inducer that runs continuously without ever advancing the heating cycle.

• Specs: 0.18" W.C. (water column) setpoint | Single-port diaphragm switch | Normally open (closes on draft) | Cross-references: HK06WC061, HK06MB061, Honeywell IS20224-5236
• OEM vs Generic: This is a genuine Carrier/Honeywell factory part with a precision-calibrated diaphragm. Off-brand switches often drift outside the ±0.05" W.C. tolerance, causing nuisance lockouts or — worse — allowing the furnace to fire without confirmed draft, a serious safety concern.
• Install difficulty: 2/5 — Power down the unit at the disconnect and thermostat before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short length of 5/16" ID vinyl tubing. Photograph the existing hose routing before disconnecting. Confirm 24V across the switch terminals to diagnose before replacing.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier PY3GNA030060NA packaged units. Also fits select Bryant and Payne models sharing the HK06WC061 / HK06MB061 specification — verify the 0.18" W.C. rating on your unit's wiring diagram or data plate before ordering. Note: HK06WC061 has been superseded by HK06MB061; both part numbers are fulfilled by the same current OEM component. Order today and your part ships same business day.