OEM Carrier Low Pressure Switch HK02ZB044 for Model PH1REA036000AAWA

This is the genuine OEM Carrier low pressure switch (part number HK02ZB044), the factory-specified replacement for the Carrier PH1REA036000AAWA packaged heat pump unit. The pressure switch is a critical safety component in the refrigerant circuit — it continuously monitors system pressure and cuts operation if pressure drops below a safe threshold. When this switch fails or sticks open, you'll typically experience no cooling or heating, repeated system lockouts, or fault codes indicating a low-pressure trip. Replacing it with the correct OEM part restores proper system protection and performance.

• Specs: Opens at 7 PSI | Closes at 22 PSI | 50" wire leads | 24V control circuit | Manufactured in Mexico to Carrier factory standards
• OEM vs Generic: This OEM switch meets exact factory design life testing for maximum reliability. Generic alternatives often carry wider pressure tolerances that can cause nuisance trips or fail to protect the compressor from genuine low-pressure conditions.
• Install difficulty: 2/5 — Recover refrigerant per EPA regulations before accessing the low-pressure port. Tools needed: manifold gauge set, 1/4" nut driver, and needle-nose pliers for spade connectors. Always verify system pressure after replacement before restarting the unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct drop-in replacement for the Carrier PH1REA036000AAWA packaged heat pump. Verify your existing switch's open/close pressure ratings and lead length against your unit's data plate before ordering. Our fitment team is available to confirm compatibility — reach out before you order if you have any questions. Order today and enjoy same-day shipping on all in-stock parts.