OEM Carrier Pressure Switch HK02ZB044 for Model PY1RPA120224ABWB

This OEM Carrier pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PY1RPA120224ABWB packaged unit. The pressure switch monitors the inducer motor's negative pressure (draft) 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 no-heat lockout, a flashing fault code, or a furnace that attempts ignition but shuts down immediately without ever lighting.

• Specs: Opens at 7" W.C. | Closes at 22" W.C. | 50" wire leads | 24V control circuit | Made in Mexico — factory OEM
• OEM vs Generic: This is the genuine Carrier OEM part, manufactured to exact factory tolerances for pressure setpoint accuracy. Aftermarket switches often carry ±15% W.C. tolerances that cause nuisance trips or fail to prove inducer operation, leading to repeat service calls.
• Install difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (continuity test). Inspect inducer hose and port for blockages before replacing the switch — a clogged port is a common misdiagnosis.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM drop-in replacement for Carrier model PY1RPA120224ABWB. Verify W.C. rating and lead length on your unit's existing switch before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before every order — call or chat today, and get your part shipped the same day.