OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH14NA04800GBAAA

These two OEM pressure switches are the factory-specified refrigerant circuit protection components for the Carrier PH14NA04800GBAAA heat pump. The high pressure switch (312926-252, 670-470#) monitors discharge-side refrigerant pressure and opens the circuit if pressure climbs dangerously high — protecting the compressor from catastrophic over-pressure failure. The low pressure switch (312926-258, 55-23#) monitors suction-side pressure and opens the circuit when pressure drops too low, preventing compressor operation in a refrigerant-starved or frosted-over condition. When either switch fails, the most common symptom is a system lockout: the unit starts briefly then trips on a fault code, or refuses to start at all. Replacing both switches together is the industry best practice when diagnosing a refrigerant-circuit fault.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | OEM Carrier Factory Authorized Part | Replaces part# 312926252
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | OEM Carrier Factory Authorized Part | Replaces part# 312926258
• OEM vs Generic: These are genuine Carrier Factory Authorized Parts with factory-calibrated trip points. Aftermarket switches often carry wider tolerances, which can cause nuisance trips or — worse — allow the compressor to operate outside safe pressure limits, shortening compressor life.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certified technician. Tools needed: manifold gauge set, refrigerant recovery equipment, 1/4" nut driver, multimeter. Always recover refrigerant before disconnecting any refrigerant-side switch. Verify system pressures after reassembly.
• Warranty: 1-year OEM manufacturer warranty on both switches. Ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PH14NA04800GBAAA heat pump (4-ton, R-410A). Verify existing switch trip-point markings on your unit's data plate or service manual before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required. Order now and receive same-day shipping on in-stock parts.