OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for Model PH13NB06000GABAA

These two OEM Carrier pressure switches are the factory-specified refrigerant safety controls for the Carrier PH13NB06000GABAA packaged heat pump unit. The high pressure switch (312926-252, 670-470 PSI) monitors the high side of the refrigerant circuit and opens the compressor circuit if discharge pressure exceeds safe limits. The low pressure switch (312926-258, 55-23 PSI) monitors the low side and shuts the compressor down if suction pressure drops below the safe threshold — a common symptom being a unit that cools briefly then locks out, or fails to start entirely. Together, these two switches protect the compressor from catastrophic over- or under-pressure damage.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | Normally closed | OEM Factory Authorized Part | Replaces: 312926252
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | Normally closed | OEM Factory Authorized Part | Replaces: 312926258
• OEM vs Generic: These are genuine Carrier Factory Authorized Parts engineered to exact cut-in/cut-out tolerances. Aftermarket pressure switches frequently drift outside factory calibration, leading to nuisance lockouts or, worse, inadequate compressor protection and premature failure.
• Install difficulty: 3/5 — Refrigerant circuit must be recovered before replacing either switch. Tools required: manifold gauge set, recovery machine, torque wrench, and multimeter to verify continuity before recharge. Always de-energize the unit and follow ASHRAE 15 safety protocols. Installation by an EPA 608-certified technician is strongly recommended.
• Warranty: 1-year OEM manufacturer warranty on both parts. Orders ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier PH13NB06000GABAA packaged heat pump system. Confirm refrigerant type and pressure switch PSI ratings against your unit's data plate and wiring diagram before ordering. Both switches are sold as an OEM-matched pair for complete refrigerant circuit protection. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — in stock and ready to ship today.