OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY3GNAA42090AA

This is the factory OEM replacement pressure switch for the Carrier PY3GNAA42090AA gas furnace, carrying original part number HK06WC061 (superseded by HK06MB061). The pressure switch monitors negative pressure created by the draft inducer motor to confirm safe venting conditions before allowing the ignition sequence to proceed. When this switch fails or sticks, the furnace will typically lock out on a pressure switch fault — the inducer runs, but the system never advances to ignition, leaving you with no heat.

• Specs: 0.18" Water Column (W.C.) rating | SPST (Single Pole, Single Throw) | Compatible with Honeywell cross-reference IS20224-5236 | Fits Carrier, Bryant, and Payne branded units on the same platform
• OEM vs Generic: OEM pressure switches are calibrated to the exact W.C. setpoint required by the furnace control board. Off-spec generic switches with even slight tolerance drift can cause nuisance lockouts or, worse, allow ignition attempts under unsafe vent conditions.
• Install difficulty: 2/5 — Power down the furnace and disconnect the hose and two electrical terminals. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer (recommended to verify inducer draw post-install). Always inspect the rubber hose for cracks before reinstalling.
• Warranty: 1-year OEM manufacturer warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility note: Designed for the Carrier PY3GNAA42090AA packaged gas/electric unit. OEM part HK06WC061 has been superseded by HK06MB061 — both numbers are fulfilled by the same current-production Carrier factory part. Verify the 0.18" W.C. rating stamped on your existing switch before ordering. Have questions about fitment? Our HVAC parts team confirms compatibility before you buy.