OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GNAA60130AA

This OEM Carrier draft pressure proving switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GNAA60130AA gas furnace. The pressure switch monitors the negative pressure generated by the draft inducer blower to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the furnace control board will lock out the ignition cycle — leaving you with a blinking fault code and no heat. Symptoms include the inducer motor running but the furnace never advancing to ignition, or an intermittent heating fault that resets after a power cycle.

• Specs: 0.18" W.C. (inches water column) set point | Single-port draft proving switch | SPST normally-open | Replaces OEM part numbers HK06WC061 & HK06MB061 | Also cross-references Honeywell IS20224-5236 and 1639D2/B
• OEM vs Generic: This is a genuine Carrier OEM-spec switch calibrated to the exact 0.18" W.C. trip point required by the PY4GNAA60130AA control board. Aftermarket switches often carry ±10–15% pressure tolerances, which can cause nuisance lockouts or — worse — allow ignition under unsafe venting conditions.
• Install Difficulty: 2/5 — Straightforward swap with the furnace powered off. Tools needed: flathead screwdriver, needle-nose pliers, and a short length of replacement rubber tubing (inspect the existing hose while you're in there). Photograph the port and tubing connection before removal. No soldering or wiring required.
• Warranty & Shipping: 1-year OEM manufacturer warranty against defects. In stock and ships same business day from our warehouse — order by 3 PM local time to go out today.

Compatibility: Engineered for the Carrier PY4GNAA60130AA gas furnace. Note that OEM part HK06WC061 has been officially superseded by HK06MB061 — both numbers are fulfilled with the current production part. Always verify the pressure rating on your existing switch's data label before ordering to confirm the 0.18" W.C. specification matches. Not sure? Contact our team and we'll verify fitment before you purchase.