OEM Carrier Draft Pressure Switch 0.18 WC for Model PY3GPAA48115NA (HK06WC061 / HK06MB061)

This OEM Carrier draft pressure proving switch is the factory-specified replacement for the Carrier PY3GPAA48115NA packaged unit. The pressure switch monitors negative pressure created by the inducer motor to confirm that proper venting is established before allowing the ignition sequence to begin. When this switch fails or sticks, the system enters a safety lockout — the inducer runs but the furnace never advances to ignition, leaving you with no heat.

• Specs: 0.18" W.C. (inches water column) set point | Normally open | Single-port | Replaces OEM part HK06WC061 (superseded by HK06MB061) | Also replaces Honeywell IS20224-5236
• OEM vs Generic: This is a genuine OEM-grade Carrier part engineered to exact W.C. tolerance. Aftermarket switches with loose calibration tolerances can trigger nuisance lockouts or — worse — allow the unit to fire without confirmed draft, creating a safety hazard.
• Install Difficulty: 2/5 — Shut off gas and power before servicing. Tools needed: 1/4" nut driver, flat-head screwdriver, and a manometer to verify W.C. reading after installation. Inspect the rubber hose port for cracks before reinstalling the tubing.
• Warranty & Shipping: 1-year OEM warranty coverage. In stock and ships same business day from our warehouse — order by 3 PM local time.

Compatibility: Designed for the Carrier PY3GPAA48115NA packaged unit. Also fits a broad range of Carrier, Bryant, and Payne furnace and packaged unit models requiring a 0.18" W.C. normally-open draft pressure switch. Always verify the W.C. rating on your existing switch before ordering. Need fitment confirmation? Our HVAC parts specialists are standing by.