OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH15NA04800GBAAA

These OEM Carrier refrigerant pressure switches are the factory-specified replacements for the Carrier PH15NA04800GBAAA heat pump. The high pressure switch (312926-252) is rated at 670 PSI cut-out / 470 PSI cut-in and protects the compressor from dangerous over-pressurization events. The low pressure switch (312926-258) safeguards the system against loss-of-charge conditions and evaporator freeze-up. When either switch fails, the system will enter a safety lockout — presenting as a unit that trips off shortly after startup, throws a fault code, or refuses to run entirely.

• Part Numbers: 312926-252 (High Pressure Switch, 670/470 PSI cutout/cut-in) | 312926-258 (Low Pressure Switch) | Factory Authorized Carrier OEM components
• OEM vs Generic: OEM switches are calibrated to factory-exact set points. Aftermarket substitutes may have wider pressure tolerances, risking nuisance trips or — worse — failure to protect the compressor under true fault conditions.
• Install Difficulty: 3/5 — Refrigerant circuit work requires EPA Section 608 certification. Tools needed: manifold gauge set, torque wrench, leak detector, and a multimeter to confirm continuity after replacement. Always recover refrigerant before replacing any pressure switch inline with the refrigerant circuit.
• Warranty: 1-year OEM manufacturer warranty. Orders placed before 3 PM EST ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH15NA04800GBAAA 4-ton, 15 SEER packaged heat pump. Verify both OEM part numbers against your unit's wiring diagram and service manual before ordering — the high and low pressure switches are not interchangeable. Need help confirming fitment? Our HVAC parts specialists are standing by.