OEM Carrier Pressure Switch HK02ZB044 — 7 PSI Open / 22 PSI Close for Model PY1RPA120180ABWA

The Carrier HK02ZB044 is the factory OEM pressure switch for the PY1RPA120180ABWA packaged unit. The pressure switch proves that the inducer motor has created sufficient negative draft before allowing the control board to advance to the ignition sequence. When this switch fails or sticks open, the system will lock out before any ignition attempt — leaving you with no heat and often a diagnostic fault code pointing to draft pressure failure. A failed switch can also be caused by a plugged condensate drain, cracked pressure tubing, or a weak inducer motor, so always verify those before replacing the part.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" lead wires | Operating Voltage: 24V | Country of Origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM switch, manufactured to exact factory tolerances and design-life specifications. Generic pressure switches frequently ship with out-of-spec setpoints that can cause nuisance lockouts or, worse, allow ignition under unsafe draft conditions.
• Install Difficulty: 2/5 — Power down the unit at the disconnect before starting. Tools needed: 1/4" nut driver, needle-nose pliers, and a manometer or magnehelic gauge to verify tubing integrity. Always inspect the rubber hose and condensate trap for blockages before installing the new switch.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PY1RPA120180ABWA. Verify the PSI setpoints (7 OPN / 22 CLS) and lead length on your existing switch before ordering to ensure a confirmed fitment. Not sure? Our HVAC parts team is available to verify compatibility before you buy — reach out before you order and we'll confirm it ships right the first time.