OEM Carrier Furnace Pressure Switch 0.18" WC for Model PY4GNAB48090NA

This is the genuine OEM Carrier draft inducer pressure switch (part number HK06WC061, current superseding part HK06MB061) for the Carrier PY4GNAB48090NA packaged gas/electric unit. The pressure switch proves that the inducer motor has established adequate negative pressure (draft) before the control board allows the ignition sequence to proceed. When this switch fails or sticks open, the furnace will lockout before attempting ignition — leaving your system stuck in a no-heat condition even though the inducer is running normally.

• Specs: 0.18" W.C. (water column) set point | Single-port draft-proving switch | Normally open | Replaces Honeywell IS20224-5236 / 1938D2/B | Compatible superseding P/N: HK06MB061
• OEM vs Generic: OEM switches are factory-calibrated to the exact 0.18" W.C. trip point required by the Carrier PY4GNAB48090NA control board. Off-spec generic switches can trip too early or too late, causing nuisance lockouts or — more dangerously — allowing operation without confirmed draft.
• Install Difficulty: 2/5 — Power down the unit at the disconnect and thermostat before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, and a manometer to verify draft if troubleshooting persists. Disconnect the rubber hose and two spade terminals, swap the switch, and re-secure the hose with a firm friction fit. Always inspect the inducer hose for cracks or blockage before replacing the switch.
• Warranty: 1-year OEM factory warranty on manufacturer defects. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY4GNAB48090NA packaged gas/electric unit. This part also applies to select Bryant and Payne models sharing the same platform. Verify the 0.18" W.C. rating on your existing switch or unit data plate before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — call or chat today.