OEM Carrier High & Low Pressure Switch Kit (312926-252 & 312926-258) for Model PH13NA02400GABAA

These are the factory OEM replacement pressure switches for the Carrier PH13NA02400GABAA heat pump. The high pressure switch (312926-252, rated 670-470 PSI) monitors refrigerant discharge pressure and shuts the compressor down before dangerously high pressure can cause mechanical failure. The low pressure switch (312926-258, rated 55-23 PSI) guards the compressor against operating in a low-charge or restricted-airflow condition. Together, these two switches form the primary refrigerant-circuit safety net for your system. When either switch fails or trips without reset, you'll typically see a compressor lockout fault code, short-cycling, or a unit that runs the indoor blower but never engages the outdoor compressor.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out / 470 PSI cut-in | Refrigerant-side protection | Factory Authorized Part | Replaces: 312926252
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out / 23 PSI cut-in | Compressor loss-of-charge protection | Factory Authorized Part | Replaces: 312926258
• OEM vs Generic: OEM switches are factory-calibrated to exact cut-in/cut-out thresholds. Generic alternatives frequently carry ±10–15% pressure tolerances, risking nuisance trips or, worse, insufficient compressor protection that voids equipment warranties.
• Install difficulty: 3/5 — Refrigerant-side work requires an EPA 608 certification. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, multimeter. Always recover refrigerant before disconnecting any pressure switch. Photograph all wire connections before removal.
• Warranty: 1-year OEM manufacturer warranty on both switches. Ships same business day from our warehouse.

Compatibility: Direct OEM fit for Carrier model PH13NA02400GABAA (2-ton, single-stage R-410A heat pump). Verify refrigerant type and cut-out pressure ratings on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.