OEM Carrier Pressure Switch HK02ZB044 for Model PH1REA120000AAWA

This OEM pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PH1REA120000AAWA packaged heat pump unit. The pressure switch monitors inducer motor operation by sensing negative pressure (draft) in the heat exchanger flue path. When the inducer creates sufficient vacuum, the switch closes to signal the control board that combustion airflow is proven — allowing the ignition sequence to proceed. A failed or stuck-open pressure switch will prevent the system from advancing past the inducer stage, triggering a no-heat lockout fault on the control board.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 24V coil voltage | 50" lead length | Country of Origin: Mexico
• OEM vs Generic: This is a genuine Carrier OEM part engineered to exact factory tolerances. Generic switches often use inconsistent setpoint calibration, leading to nuisance lockouts or — worse — unsafe operation due to insufficient draft proof.
• Install difficulty: 2/5 — Power down the unit before servicing. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, manometer (for setpoint verification). Note tubing port orientation and lead polarity before disconnecting. Always check the rubber vacuum hose for cracks or blockages before condemning the switch.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for Carrier model PH1REA120000AAWA packaged heat pump equipment. Verify inducer pressure setpoints on your unit's wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy for peace of mind.