OEM Carrier Draft Pressure Switch 0.18" WC SPST for Model PY3GNAA42060AA

This OEM draft inducer pressure switch is the factory-authorized replacement for the Carrier PY3GNAA42060AA packaged gas unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or gets stuck open, the control board cannot verify that the heat exchanger is being safely vented — resulting in a hard lockout before ignition, a "no heat" call, or repeated failed ignition attempts. OEM part number HK06WC061 has been superseded by HK06MB061, which is the current factory-approved direct replacement at the same 0.18" WC rating.

• Specs: 0.18" Water Column (W.C.) opening setpoint | SPST normally open | Replaces HK06WC061 / HK06MB061 | Also cross-references Honeywell IS20224-5236 and 1938D2/B
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. tolerances at the factory. Generic aftermarket units frequently drift off-setpoint, causing nuisance lockouts or — worse — failing to detect a blocked flue, creating a potential safety hazard.
• Install difficulty: 2/5 — Power down and disconnect gas before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and tubing pick for hose barb removal. Photograph hose and wiring connections before disconnecting. Always verify inducer motor RPM and tubing integrity before condemning the switch.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PY3GNAA42060AA packaged gas/electric unit. Also fits select Bryant and Payne models that share the 0.18" WC SPST pressure switch specification. Verify the W.C. rating printed on your existing switch's label before ordering — incorrect W.C. setpoints will cause persistent lockouts. Questions about fitment? Our HVAC parts team confirms compatibility before you buy.