OEM Carrier Draft Inducer Pressure Switch 0.18" WC for Model PY4GPAB48090NA (HK06WC061 / HK06MB061)

This is the factory-authorized replacement pressure switch for the Carrier PY4GPAB48090NA packaged unit. The pressure switch proves that the draft inducer motor is operating correctly before allowing the ignition sequence to begin. When this switch fails or sticks, the control board cannot verify proper venting and will lock out the system entirely — resulting in a furnace or heat pump that refuses to fire, often with a flashing fault code indicating a pressure switch error. Common failure symptoms include the unit running the inducer but never advancing to ignition, or nuisance lockouts during cold or wet weather.

• Specs: 0.18" W.C. (water column) set point | SPST (Single-Pole, Single-Throw) | Draft inducer proving switch | Replaces OEM part numbers HK06WC061 and updated supersede HK06MB061 | Also cross-references Honeywell IS20224-5236
• OEM vs Generic: This OEM-spec switch is calibrated to the exact 0.18" W.C. trip point required by the Carrier PY4GPAB48090NA control board. Generic aftermarket switches often carry wider tolerances that cause nuisance trips or fail to prove draft reliably, leading to repeat service calls.
• Install difficulty: 2/5 — Straightforward swap. Tools needed: 1/4" nut driver, flathead screwdriver, and needle-nose pliers for hose barb removal. Always disconnect power at the breaker before servicing. Photograph all tubing connections before removal to ensure correct reassembly of the rubber sensing hose.
• Warranty: 1-year manufacturer's warranty on genuine OEM part. Orders placed before 3 PM local time ship same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GPAB48090NA packaged unit. Also fits a broad range of Carrier, Bryant, and Payne furnaces and packaged units using the 0.18" WC pressure switch specification — confirm your unit's data plate and existing switch rating before ordering. Note: HK06WC061 has been superseded by HK06MB061; both part numbers are fulfilled by this listing. Questions about fitment? Our HVAC parts specialists verify compatibility before you buy.