OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH13PB04800GAAAA

These are the factory OEM pressure switches specified for the Carrier PH13PB04800GAAAA heat pump. The high pressure switch (312926-252) monitors refrigerant discharge pressure and cuts the compressor when pressure exceeds safe limits — protecting the compressor from catastrophic failure. The low pressure switch (312926-258) monitors suction-side pressure and shuts down operation during low-charge or low-airflow conditions. Together, they form the primary refrigerant-side safety circuit. When either switch fails or trips without resetting, the system will lock out, display a fault code, or refuse to start — leaving the unit blowing unconditioned air.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | Normally closed | SPST | R-410A compatible | Factory Authorized Part
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | Normally closed | SPST | R-410A compatible | Factory Authorized Part
• OEM vs Generic: Genuine Carrier OEM switches are factory-calibrated to exact cut-in/cut-out tolerances. Off-brand alternatives frequently deviate from spec, causing nuisance trips or — worse — failing to trip under true over-pressure conditions, risking compressor damage.
• Install difficulty: 3/5 — Refrigerant circuit work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, 1/4" nut driver, needle-nose pliers, multimeter. Always recover refrigerant before opening the refrigerant circuit; verify switch continuity before reconnecting power.
• Warranty: 1-year OEM factory warranty on both switches. Ships same business day from our warehouse.

Compatibility: Engineered as direct OEM replacements for the Carrier PH13PB04800GAAAA 4-ton heat pump. Verify cut-in/cut-out pressure ratings on your unit's wiring diagram or data plate before ordering. Not sure which switch you need? Our HVAC parts specialists can confirm fitment — contact us before you order and we'll get you the right part the first time.