OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GNA024040NA

This OEM Carrier draft pressure switch (part number HK06WC061, updated replacement HK06MB061) is the factory-specified pressure proving switch for the Carrier PY3GNA024040NA packaged unit. Its job is to verify that the inducer motor is producing adequate negative pressure before allowing the control board to proceed with ignition. When this switch fails, the furnace will go into a hard lockout — typically before any ignition attempt — leaving you with a system that powers on but produces no heat.

• Specs: 0.18" Water Column (WC) | Normally open, closes on negative pressure | Single-port design | Cross-references Honeywell IS20224-5236 | Compatible with Bryant, Carrier, and Payne platforms
• OEM vs Generic: OEM switches are calibrated to the exact ±0.01" WC tolerance required by this unit. Off-spec generic switches can trigger nuisance lockouts or, worse, allow ignition under unsafe draft conditions — always use OEM on pressure-sensitive packaged units.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: flathead screwdriver, 1/4" nut driver, manometer (recommended to verify draft pressure post-install). Photograph hose routing before disconnecting. The hose barb connects to the inducer housing port; ensure tubing is free of cracks or blockage.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility & Supersession Note: Originally sold as HK06WC061, this part has been superseded by HK06MB061 — the direct OEM replacement shipped for all new orders. Both part numbers are fully interchangeable on the Carrier PY3GNA024040NA. Also fits select Bryant and Payne packaged unit and furnace models with a 0.18" WC pressure switch specification. Verify the WC rating on your existing switch before ordering. Not sure? Our HVAC-certified team will verify fitment before you buy — contact us before placing your order.