OEM Carrier High Pressure Switch 670-470 PSI for Model PH4ANG030000BBAA

This OEM high pressure switch (part number 312926-252) is the factory-specified replacement for the Carrier PH4ANG030000BBAA heat pump system. The high pressure switch is a critical refrigerant-circuit safety control that continuously monitors system discharge pressure. When refrigerant pressure exceeds the upper threshold (670 PSI cut-out), the switch opens the control circuit and shuts down the compressor to prevent catastrophic system damage. When pressure drops back to the reset point (470 PSI cut-in), normal operation can resume. Common failure symptoms include nuisance high-pressure lockouts, the system refusing to start, or fault codes indicating a high-pressure trip on the control board.

• Specs: Cut-Out: 670 PSI | Cut-In: 470 PSI | OEM Part Number: 312926-252 | Factory-certified fit for Carrier PH4ANG030000BBAA | Genuine Carrier Factory Authorized Part
• OEM vs Generic: This is a genuine OEM Carrier component with factory-calibrated trip points. Aftermarket pressure switches often carry ±5–10% PSI tolerance, risking nuisance trips or — worse — allowing the system to run outside safe pressure limits and damaging the compressor.
• Install difficulty: 3/5 — Refrigerant system work requires EPA 608 certification. A licensed HVAC technician must recover refrigerant before accessing high-side components. Tools needed: manifold gauge set, refrigerant recovery machine, adjustable wrench, multimeter for continuity verification after replacement.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PH4ANG030000BBAA. Always verify the PSI rating on your existing switch and confirm your model's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions. Order now and ship today!