OEM Carrier Furnace Draft Pressure Switch 0.18" WC for Model PY3GNAA30060AA

This OEM draft pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY3GNAA30060AA packaged gas unit. The pressure switch proves that the inducer blower is operating correctly before allowing the ignition sequence to proceed — it is a critical safety device in the furnace control loop. When this switch fails or sticks open, the furnace will lock out before ignition, leaving you with a non-heating system. Common symptoms include the inducer motor running but the ignition sequence never starting, a blinking fault code on the control board indicating a pressure switch fault, or intermittent heating that cuts out under certain conditions.

• Specs: 0.18" W.C. (water column) set point | Factory-matched Honeywell sensing element | Compatible with single-stage inducer systems | Cross-references: Honeywell IS20224-5236, 1639D2/B
• OEM vs Generic: OEM switches use precision-calibrated diaphragms set to the exact 0.18" W.C. threshold required by your unit's heat exchanger design. Off-brand substitutes can drift out of tolerance, causing nuisance lockouts or — more dangerously — allowing ignition before adequate combustion airflow is confirmed.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, small flathead screwdriver, manometer (recommended for verification). Disconnect the hose and two wires, swap the switch, reconnect, and run a heating cycle. Always check for hose cracks while the panel is open.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY3GNAA30060AA packaged gas unit. Also fits select Bryant and Payne models sharing the same inducer/heat exchanger configuration. Note: OEM part number HK06WC061 has been superseded by HK06MB061 — this listing ships the current production equivalent. Verify the 0.18" W.C. rating on your unit's wiring diagram or existing switch before ordering. Our team is available to confirm fitment before you buy.