OEM Carrier Low Pressure Switch 7 PSI Open / 22 PSI Close for Model PH1REA120000AAWB

This OEM Carrier pressure switch (part number HK02ZB044) is the factory-specified replacement for the Carrier PH1REA120000AAWB packaged heat pump unit. The pressure switch monitors refrigerant or inducer pressure within the system and proves safe operating conditions before allowing the unit to proceed through its heating or cooling sequence. When this switch fails, the system typically locks out before ignition or will not initiate a heating call at all — leaving you with a unit that runs the inducer fan but goes no further. A faulty or stuck-open pressure switch is one of the most common causes of a "no-heat" service call on Carrier packaged equipment.

• Specs: 7 PSI open / 22 PSI close | 50" wire leads | 24V control circuit rated | Country of Origin: Mexico | OEM Part Number: HK02ZB044
• OEM vs Generic: This is a genuine OEM Carrier part, manufactured to exact factory design-life testing standards. Generic aftermarket pressure switches are often rated at wider tolerances, risking nuisance lockouts or missed fault conditions that can damage system components over time.
• Install difficulty: 2/5 — Shut off power to the unit at the disconnect before beginning. Tools needed: flat-head screwdriver, needle-nose pliers, and a multimeter (to verify switch continuity before reinstallation). Photograph existing wiring and lead routing before disconnecting. Swap leads one at a time to avoid mis-wiring.
• Warranty: 1-year OEM factory warranty on parts. Orders placed before our same-day cutoff ship the same business day from our warehouse.

Compatibility: Designed for the Carrier PH1REA120000AAWB packaged heat pump unit. Always verify the part number on your existing switch and cross-reference your unit's data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before your order ships — contact us today and get your system back up and running fast.