OEM Carrier Low Pressure Switch HK02ZB044 — 7 PSI Open / 22 PSI Close for Model PH1RPA120000AAWB

This is the genuine OEM Carrier pressure switch (part number HK02ZB044), the factory-specified replacement for the Carrier PH1RPA120000AAWB packaged heat pump unit. The pressure switch is a critical safety and proving device in the refrigerant circuit: it monitors system pressure and signals the control board that operating conditions are within safe range. When this switch fails or becomes stuck open, the unit will refuse to start, go into safety lockout, or short-cycle — leaving you with no heating or cooling and an often misleading fault code. Replacing with the correct OEM part restores precise pressure sensing and factory-grade reliability.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control voltage | Country of origin: Mexico — factory-matched to Carrier design tolerances
• OEM vs Generic: OEM pressure switches meet exact factory design-life testing and preserve your equipment warranty. Aftermarket alternatives often lack precise calibration, risking nuisance lockouts or, worse, masking a genuine low-pressure refrigerant fault.
• Install difficulty: 2/5 — Disconnect power before beginning. Tools needed: 1/4" nut driver, needle-nose pliers, and a short extension. Note wire polarity and lead routing before disconnecting the old switch. Confirm system pressures are nominal before condemning this part.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse on all in-stock orders.

Compatibility: Designed for the Carrier PH1RPA120000AAWB packaged heat pump unit. Always verify the OEM part number printed on your existing switch before ordering to confirm fitment. Our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork, no return hassles.