OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GNAA48130AA

This OEM draft pressure switch (part number HK06WC061, superseded by HK06MB061) is the factory-specified replacement for the Carrier PY4GNAA48130AA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm proper venting before allowing ignition to proceed. When it fails or sticks open, the control board cannot verify inducer operation — resulting in a no-heat lockout condition, typically before a spark or ignition attempt is ever made.

• Specs: 0.18" Water Column (WC) rating | Single-port draft sensing | Factory-matched set point | Replaces Honeywell IS20224-5236 | Superseded OEM part: HK06MB061
• OEM vs Generic: OEM pressure switches are calibrated to exact WC set points at the factory. Aftermarket units can drift ±0.02" WC or more, causing nuisance lockouts or — worse — allowing ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended for verification). Disconnect the rubber sensing hose from the inducer housing and swap the switch; verify hose is free of cracks or blockages before reinstalling.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Fits Carrier model PY4GNAA48130AA packaged unit. Also compatible with select Bryant and Payne models using the 0.18" WC draft pressure switch specification. Always verify the WC rating on your existing switch's label before ordering — an incorrect rating will cause nuisance lockouts or unsafe operation. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.