OEM Carrier High Pressure Switch 670/470 PSI for Model PH4ANG048000BBAA

This is the factory OEM high pressure switch (part# 312926-252) for the Carrier PH4ANG048000BBAA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety control that continuously monitors system discharge pressure. When refrigerant pressure rises above the safe operating threshold — due to a dirty condenser coil, blocked airflow, overcharge, or failed condenser fan motor — the switch opens to shut down the compressor and prevent catastrophic system damage. Common failure symptoms include nuisance high-pressure lockouts, compressor short-cycling, or fault codes indicating high-pressure trips on the system control board.

• Specs: Cut-out: 670 PSI | Cut-in: 470 PSI | OEM Part# 312926-252 | Factory-certified safety control for R-410A systems
• OEM vs Generic: This is a genuine Carrier OEM switch, factory-matched to exact cut-out and cut-in pressure setpoints for the PH4ANG048000BBAA. Aftermarket switches with off-tolerance trip points can allow unsafe pressures or cause premature nuisance trips, shortening compressor life.
• Install difficulty: 3/5 — Refrigerant circuit work requires EPA Section 608 certification. Recover refrigerant before replacing. Tools needed: manifold gauge set, refrigerant recovery machine, adjustable wrench, leak detector. Always verify correct pressure ratings before installation.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH4ANG048000BBAA 4-ton packaged heat pump. Verify your unit's data plate and existing switch pressure ratings before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping on all in-stock orders.