OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GNAB36060AA

This OEM Carrier draft pressure proving switch (part number HK06WC061, current superseding part HK06MB061) is the factory-specified replacement for the Carrier PY4GNAB36060AA packaged unit. The pressure switch monitors negative pressure created by the induced-draft blower to confirm safe combustion venting before the gas valve is allowed to open. When this switch fails or the pressure signal is interrupted, the control board cannot advance past the inducer proving stage — resulting in a hard lockout with no ignition, no heat, and typically a diagnostic fault code pointing to a pressure switch or inducer circuit fault.

• Specs: 0.18" Water Column (W.C.) set point | SPST normally open | Replaces OEM part HK06WC061 / superseded by HK06MB061 | Cross-references Honeywell IS20224-5236 | Factory-matched switching threshold
• OEM vs Generic: OEM pressure switches are calibrated to exact W.C. tolerances at the factory. Aftermarket units frequently drift outside acceptable switching ranges, causing nuisance lockouts or — worse — failing to detect a blocked flue, creating a safety hazard. Always match the rated W.C. exactly.
• Install difficulty: 2/5 — Shut off power and gas before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, digital manometer (recommended to verify inducer static pressure after install). Photograph hose routing before disconnecting the pressure tube. Inspect the rubber hose for cracks or blockages before replacing the switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Fits Carrier model PY4GNAB36060AA packaged units. Also compatible with select Bryant and Payne models using the 0.18" W.C. SPST pressure switch specification. Verify the W.C. rating printed on your existing switch before ordering — an incorrect W.C. rating will cause the unit to fault. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy.