OEM Carrier High & Low Pressure Switch Kit (312926-252 & 312926-258) for Model PH13NB04200GABAA

These are the factory-specified OEM replacement pressure switches for the Carrier PH13NB04200GABAA heat pump. The high pressure switch (312926-252, rated 670-470# cutout/cut-in) monitors refrigerant discharge pressure and opens the control circuit if dangerously high pressures are detected, protecting the compressor from catastrophic failure. The low pressure switch (312926-258, rated 55-23# cutout/cut-in) monitors suction-side pressure and shuts the compressor down under conditions that could cause damage from low charge, refrigerant restriction, or icing. When either switch fails, typical symptoms include compressor lockout, short-cycling, nuisance trip faults on the control board, or a system that runs the fan but never engages the compressor.

• Specs — High Pressure Switch (312926-252): 670 PSI cutout / 470 PSI cut-in | Refrigerant-rated | SPST-NC (normally closed) | Factory Authorized Part, Carrier RCD Division
• Specs — Low Pressure Switch (312926-258): 55 PSI cutout / 23 PSI cut-in | SPST-NC (normally closed) | Pre-wired leads | Factory Authorized Part, Carrier RCD Division
• OEM vs Generic: OEM Carrier pressure switches are calibrated to exact PSI setpoints at the factory. Generic substitutes often carry ±10–15% pressure tolerances, which can cause nuisance trips or, worse, failure to protect the compressor under genuine fault conditions — risking a $1,200+ compressor replacement.
• Install difficulty: 3/5 — System must be recovered of refrigerant before replacing high-side or low-side switches on a sealed refrigerant circuit. Tools needed: refrigerant recovery machine, manifold gauge set, wire stripper, and multimeter. EPA 608 certification required for refrigerant handling. Always verify the switch is truly faulty (open when system is off and pressurized) before replacement.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH13NB04200GABAA heat pump (4-ton, single-stage R-410A). Verify both part numbers against your unit's wiring diagram and data plate before ordering. Our team is available to confirm fitment — order with confidence and get your system back online fast.