OEM Carrier Pressure Switch HK02ZB044 — 7 PSI Open / 22 PSI Close for Model PH1RPA090000AAWA

This is the factory OEM replacement pressure switch for the Carrier PH1RPA090000AAWA packaged unit. The pressure switch proves that the inducer motor has established proper draft before allowing the ignition sequence to proceed. When this switch fails or sticks open, the control board never receives the signal to advance to ignition — resulting in a no-heat condition, repeated lockout faults, or a system that runs the inducer continuously without lighting the burner. If your unit is cycling into lockout before the igniter glows, a failed pressure switch is one of the first components to test.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | OEM part number HK02ZB044 | Manufactured in Mexico
• OEM vs Generic: This is the genuine Carrier OEM switch, factory-calibrated to the exact water column setpoints required by the PH1RPA090000AAWA. Generic switches often carry ±10–15% pressure tolerances that can cause nuisance lockouts or — worse — allow ignition under unsafe draft conditions.
• Install difficulty: 2/5 — Shut off power at the disconnect before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, and a manometer or U-tube to verify switch setpoints after installation. Photograph and label all tubing connections before removal. Inspect the rubber port tube for cracks or moisture blockage before replacing the switch.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PH1RPA090000AAWA packaged unit. Verify the PSI open/close setpoints on your unit's wiring diagram or data plate before ordering — multiple pressure switch configurations exist across the PH1 product line. Our parts specialists are available to confirm fitment before you purchase.