OEM Carrier Draft Pressure Switch 0.18" WC for Model PY3GPAA30040NA (HK06WC061)

This OEM Carrier draft pressure switch is the factory-specified replacement for the Carrier PY3GPAA30040NA packaged unit. The pressure switch monitors the negative pressure created by the inducer blower motor to confirm proper venting before allowing ignition to proceed. When this switch fails or sticks, the control board never receives the "all clear" signal — resulting in a no-heat lockout condition, a flashing fault code, or a furnace that attempts to start and immediately shuts down before the igniter even fires.

• Specs: 0.18" W.C. (water column) set point | Normally open | Single-port | Replaces OEM part number HK06WC061 (superseded to HK06MB061) | Honeywell cross-reference: IS20224-5236
• OEM vs Generic: This is a genuine OEM-equivalent part engineered to the factory W.C. rating. Off-spec aftermarket switches with incorrect set points can trigger nuisance lockouts or, worse, allow operation under unsafe draft conditions.
• Install difficulty: 2/5 — Power down and lock out the unit before servicing. Disconnect the rubber pressure tubing and two wire leads, swap the switch, and restore power. Tools needed: flathead screwdriver, needle-nose pliers, manometer (recommended to verify draft pressure). Always check the inducer and flue path if the original switch failed prematurely.
• Warranty: 1-year manufacturer warranty on OEM part. Ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed for the Carrier PY3GPAA30040NA packaged unit. Also fits select Bryant and Payne models sharing the HK06WC061 / HK06MB061 specification — verify the W.C. rating on your existing switch label before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.