OEM Carrier Draft Pressure Switch 0.18" WC for Model PY4GNAB48130NA

This OEM draft pressure proving switch is the factory-specified replacement for the Carrier PY4GNAB48130NA packaged unit. The pressure switch monitors negative pressure created by the inducer (draft) motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify safe flue conditions — resulting in a hard lockout before the burners ever fire. Common symptoms include a furnace that attempts to start, runs the inducer briefly, then shuts down with a pressure switch fault code.

• Specs: 0.18" W.C. (inches water column) setpoint | Single-port draft proving switch | Honeywell-manufactured OEM component (cross-ref: IS20224-5236, 1938D2/B) | Replaces both HK06WC061 and its current successor HK06MB061
• OEM vs Generic: OEM pressure switches are calibrated to exact factory W.C. tolerances. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — worse — allowing operation under unsafe draft conditions. Always match the W.C. rating exactly.
• Install Difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended for verification). Label and photograph hose port connections before removal. Inspect rubber tubing for cracks while you have the panel open.
• Warranty & Shipping: 1-year OEM factory warranty. In stock and ships same business day from our warehouse. Note: HK06WC061 is the legacy part number; current OEM replacement ships as HK06MB061 — same fit, form, and function.

Compatibility: Designed for the Carrier PY4GNAB48130NA packaged gas/electric unit. Also fits a range of Carrier, Bryant, and Payne furnaces and packaged units sharing the 0.18" W.C. pressure switch specification — verify your unit's data plate and existing switch W.C. rating before ordering. Our team is available to confirm fitment prior to purchase.