OEM Carrier Furnace Draft Pressure Switch 0.18 WC for Model PY3GPAA30040AA (HK06WC061)

This is the factory-specified OEM draft inducer pressure switch for the Carrier PY3GPAA30040AA packaged unit. The pressure switch is a critical safety device that monitors negative pressure created by the inducer motor to confirm proper venting before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board cannot verify safe draft conditions — resulting in a hard lockout before the burners ever fire. Common symptoms include a furnace that attempts to start but shuts down immediately, a rapidly flashing fault code on the control board, or an inducer that runs continuously with no ignition.

• Specs: 0.18" W.C. (inches water column) set point | Single-pole, normally open | Replaces OEM part HK06WC061 (current supersede: HK06MB061) | Also crosses to Honeywell IS20224-5236
• OEM vs Generic: OEM switches are factory-calibrated to the exact 0.18" W.C. trip point specified for this model. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — more dangerously — allowing ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer if verifying inducer performance. Photograph existing pressure tube routing before disconnecting. Swap the hose barb connection and two-wire harness connector.
• Warranty: 1-year OEM factory warranty against defects. Orders ship same business day from our warehouse stock.

Compatibility: Engineered as the direct OEM replacement for Carrier PY3GPAA30040AA packaged units. Also fits a broad range of Carrier, Bryant, and Payne models sharing the 0.18" W.C. specification — verify your unit's existing switch rating on the data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy.