OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for Model PH14NB02400GAAAA

This factory-matched pair of OEM Carrier pressure switches is the direct replacement for the Carrier PH14NB02400GAAAA heat pump. The High Pressure Switch (312926-252) is rated at 670/470 PSI (cut-out/cut-in) and trips the system when refrigerant pressure exceeds safe operating limits, protecting the compressor from catastrophic over-pressure damage. The Low Pressure Switch (312926-258) is rated at 55/23 PSI (cut-out/cut-in) and opens the control circuit when suction pressure drops too low — typically caused by low refrigerant charge, a restricted filter, or an iced coil. Together, these two switches serve as the first line of refrigerant-circuit defense in your heat pump.

Common failure symptoms include: system locks out shortly after startup, error codes indicating high or low pressure faults, compressor cycling on and off rapidly, or the unit refusing to run in either heating or cooling mode. A faulty pressure switch that is stuck open will prevent operation entirely; one stuck closed removes critical safety protection from your compressor.

• High Pressure Switch Specs: Part# 312926-252 | Cut-Out: 670 PSI | Cut-In: 470 PSI | OEM Carrier Factory Authorized Part | Replaces cross-reference LP18-094
• Low Pressure Switch Specs: Part# 312926-258 | Cut-Out: 55 PSI | Cut-In: 23 PSI | OEM Carrier Factory Authorized Part | Sensata PS80-02-F1270 platform
• OEM vs Generic: OEM pressure switches are calibrated to exact factory PSI set-points. Aftermarket alternatives frequently use wider-tolerance diaphragms that trip prematurely or fail to protect against real fault conditions — risking compressor burnout and voiding manufacturer warranties.
• Install difficulty: 3/5 — System must be recovered of refrigerant before replacing refrigerant-circuit pressure switches. Tools needed: manifold gauge set, refrigerant recovery machine, adjustable wrench, wire stripper, multimeter. Licensed EPA 608 technician required for refrigerant handling. Always verify set-point ratings on the old switch before installing a replacement.
• Warranty: 1-year OEM factory warranty on both parts. Ships same business day from our warehouse.

Compatibility: Engineered as the factory OEM replacement for Carrier model PH14NB02400GAAAA heat pump. Confirm your existing switch PSI ratings against the data plate on your unit prior to ordering. Our HVAC parts specialists are available to verify fitment before you purchase — order with confidence and get it shipped today.