OEM Carrier High & Low Pressure Switch Kit (312926-252 & 312926-258) for Model PH13NB048000ABAA

This listing includes both OEM Carrier refrigerant pressure switches factory-specified for the Carrier PH13NB048000ABAA packaged heat pump unit. The high pressure switch (312926-252, rated 670-470 psi) monitors the refrigerant circuit for dangerously elevated discharge pressures and cuts compressor power before damage occurs. The low pressure switch (312926-258, rated 55-23 psi) protects the compressor from running under low-charge or restriction conditions. When either switch fails or trips without resetting, the unit will typically lock out on a fault code, short-cycle, or refuse to enter the cooling or heating cycle entirely.

• Specs — High Pressure Switch (312926-252): 670 psi cut-out / 470 psi cut-in | SPST normally closed | Factory Authorized Part | Sensata-manufactured | Replaces 312926252
• Specs — Low Pressure Switch (312926-258): 55 psi cut-out / 23 psi cut-in | SPST normally closed | Factory Authorized Part | Sensata PS80-02-F1270 | Replaces 312926258
• OEM vs Generic: OEM Carrier pressure switches are precision-calibrated to exact cut-out/cut-in tolerances. Generic alternatives frequently deviate from rated trip points, risking compressor failure from under- or over-pressure operation — especially critical on R-410A systems operating at higher refrigerant pressures.
• Install difficulty: 3/5 — System refrigerant must be recovered before replacing refrigerant-side pressure switches. Tools required: manifold gauge set, refrigerant recovery machine, spanner wrench, multimeter, and torque wrench. EPA Section 608 certification required. Photograph all wiring connections prior to removal. Leak-check all fittings after reinstallation.
• Warranty: 1-year OEM factory warranty. Both switches ship same business day from our warehouse.

Compatibility: Both switches are factory-specified replacements for the Carrier PH13NB048000ABAA packaged heat pump unit. The PH13NB series is a 4-ton (048 = 48,000 BTU) R-410A single-stage packaged heat pump. Always verify part numbers against your unit's data plate before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — order now and ships today.