OEM Carrier High Pressure Switch 670/470 PSI for Model PH4ANG042000BCAA

This OEM high pressure switch (part number 312926-252) is the factory-specified safety control replacement for the Carrier PH4ANG042000BCAA packaged heat pump unit. The high pressure switch continuously monitors refrigerant circuit pressure and opens the control circuit — cutting the compressor — the moment system pressure exceeds the upper trip threshold. When this switch fails or trips on a fault, you'll typically see the unit locking out on a high-pressure fault code, the compressor cycling off unexpectedly, or the system shutting down entirely with no cooling or heating output. A faulty switch that fails to trip can also allow dangerously elevated pressures that damage the compressor, making timely replacement critical.

• Specs: 670 PSI cut-out / 470 PSI cut-in | OEM trip thresholds factory-matched to Carrier specifications | Direct plug-in wiring harness | Replaces legacy part number 312926252
• OEM vs Generic: This is a genuine Carrier OEM switch manufactured to exact factory trip-point tolerances. Aftermarket pressure switches can carry ±5–10% PSI variance, risking premature trips or — worse — failure to protect the compressor under true high-pressure events.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608-certified technician. The system must be safely de-energized and refrigerant pressure relieved before replacing this switch. Tools needed: multimeter, 1/4" nut driver, refrigerant gauge manifold. Always confirm the root cause of high-pressure faults (dirty coils, failed fan motor, refrigerant overcharge) before replacing the switch.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for Carrier model PH4ANG042000BCAA packaged heat pump systems. Verify your existing switch's PSI rating on the data plate or existing component label before ordering. Our parts specialists are available to confirm fitment — call or chat before you buy. Order now for same-day shipping!