OEM Carrier Pressure Switch HK02ZB044 for Model PY1RPA090125ACWB

This OEM pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PY1RPA090125ACWB packaged gas/electric unit. The pressure switch monitors the inducer draft motor's negative pressure to confirm safe flue gas venting before allowing the ignition sequence to proceed. When this switch fails, the furnace or packaged unit will lock out before ignition — often resulting in a no-heat call with a pressure switch fault code on the control board. A faulty switch may also cause the unit to short-cycle, repeatedly attempt ignition, or fail to advance past the inducer pre-purge stage.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 24V coil voltage | 50" wire leads | Factory-matched water column (W.C.) rating for the PY1RPA090125ACWB inducer assembly
• OEM vs Generic: This is a genuine Carrier OEM part, manufactured to exact design specifications and factory pressure tolerances. Generic aftermarket switches often carry wider set-point variance, risking nuisance lockouts or — worse — failure to detect a blocked flue condition.
• Install difficulty: 2/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, manometer (recommended to verify switch set point post-install). Label or photograph the hose port and wire connections before removal. Swap hoses and leads to matching ports on the new switch.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY1RPA090125ACWB packaged gas/electric unit. Verify the PSI rating (7# open / 22# close) and lead length (50") against your unit's data plate and existing switch label before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — contact us before you order.