OEM Carrier Pressure Switch HK02ZB044 for Model PY1REA090125ACWA

This OEM pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PY1REA090125ACWA gas furnace. The pressure switch monitors the negative pressure produced by the inducer (draft) motor to confirm safe venting conditions before allowing ignition to proceed. When it fails — or when the inducer motor weakens — the pressure switch stays open, the control board detects no proof-of-draft, and the furnace locks out before the gas valve ever opens. The result: a furnace that attempts to start, then immediately shuts down with no heat delivered.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | Factory-rated cut-in/cut-out tolerances | Country of Origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM switch, engineered to exact factory pressure setpoints. Off-brand switches often carry wide pressure tolerances that can allow unsafe ignition conditions or cause repeated nuisance lockouts — always use OEM on gas-fired appliances.
• Install difficulty: 2/5 — Turn off power and gas before servicing. Tools needed: 1/4" nut driver, flathead screwdriver, multimeter (to verify switch continuity), and a manometer (to confirm inducer draft if re-diagnosing). Photograph hose routing before disconnecting. The switch snaps or screws to the inducer housing and is typically accessible without major disassembly.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY1REA090125ACWA. Verify your unit's part number on the data plate or wiring diagram before ordering. Not sure if this is the right switch? Our HVAC parts specialists confirm fitment before you buy — call or chat today. Order now and get same-day shipping on all in-stock parts.