OEM Carrier High Pressure Switch 670-470# for Model PH4ANG048000BAAA

This OEM high pressure switch (part number 312926-252) is the factory-specified replacement for the Carrier PH4ANG048000BAAA packaged heat pump unit. The high pressure switch continuously monitors refrigerant pressure on the high side of the refrigeration circuit. When system pressure exceeds the rated cutout threshold, the switch opens the control circuit, shutting the compressor down to prevent catastrophic mechanical failure. A faulty high pressure switch can cause nuisance lockouts, compressor short-cycling, or a unit that trips on high pressure fault codes even when system pressures are normal.

• Specs: 670 PSI cutout / 470 PSI reset | SPST normally closed | Factory-calibrated pressure setpoints | OEM part number 312926-252
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part with factory-calibrated cutout and reset pressures. Aftermarket switches frequently carry wider tolerances, risking either nuisance trips or — more dangerously — failure to protect the compressor at true fault conditions.
• Install difficulty: 3/5 — Refrigerant system must be recovered before replacing a high pressure switch on a live circuit. Tools required: manifold gauge set, refrigerant recovery machine, adjustable wrench, and a multimeter to confirm continuity after installation. Licensed EPA 608-certified technician required.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Confirmed fit for Carrier model PH4ANG048000BAAA packaged heat pump. Verify part number 312926-252 against your unit's wiring diagram and data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping on all stocked parts.