OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GEAB60090AA

This OEM Carrier pressure switch (part# HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GEAB60090AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm safe venting conditions before allowing the ignition sequence to proceed. When the switch fails — or when a blocked flue, cracked pressure tubing, or worn inducer creates insufficient draft — the control board receives no proof signal and the furnace enters a lockout, producing a no-heat call with no ignition attempt.

• Specs: 0.18" W.C. (water column) set point | Normally open | Spade terminal connections | Factory-matched Honeywell IS20224-5236 / 1938D2/B equivalent | Compatible replacement: HK06MB061
• OEM vs Generic: This is a genuine Carrier factory-authorized part. OEM switches are calibrated to exact set-point tolerances, ensuring reliable draft proving every cycle. Generic alternatives may drift off set-point, causing nuisance lockouts or — worse — unsafe combustion events.
• Install difficulty: 2/5 — Disconnect power before beginning. Tools needed: 1/4" nut driver, flathead screwdriver, needle-nose pliers. Inspect pressure tubing for cracks and blockages before installing the new switch. Photograph all tube routing before removal.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GEAB60090AA packaged unit. Also fits select Bryant and Payne models sharing the same inducer/vent configuration. Always verify the 0.18" W.C. rating on your existing switch or equipment data plate before ordering. Note: HK06WC061 has been factory-superseded by HK06MB061 — both part numbers are fulfilled with the current production version. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — ships today.