OEM Carrier High & Low Pressure Switch Kit (312926-252 & 312926-258) for Model PH13NA04800GABAA

This factory-matched OEM pressure switch kit includes both the 312926-252 High Pressure Switch (670-470 PSI) and the 312926-258 Low Pressure Switch (55-23 PSI) — the two safety switches Carrier specifies for the PH13NA04800GABAA 4-ton heat pump. Together, these switches continuously monitor refrigerant pressure on both the high and low sides of the refrigerant circuit. When pressures exceed or fall outside safe operating limits, these switches open the control circuit and shut the system down to protect the compressor from catastrophic failure. Common failure symptoms include nuisance high-pressure lockouts, the system refusing to start on a hot day, the unit tripping off shortly after startup, or fault codes pointing to low-side pressure faults.

• Specs — High Pressure Switch (312926-252): 670 PSI cut-out | 470 PSI cut-in | Factory Authorized Carrier OEM part | Replaces legacy P/N 312926252
• Specs — Low Pressure Switch (312926-258): 55 PSI cut-out | 23 PSI cut-in | Sensata PS80-02-F1270 platform | Color-coded leads for error-free wiring
• OEM vs Generic: OEM switches are factory-calibrated to exact cut-out/cut-in tolerances. Generic switches can drift ±10–15 PSI, causing nuisance trips or — worse — failing to protect the compressor under a true fault condition.
• Install difficulty: 3/5 — Refrigerant system must be recovered before replacing pressure switches. Required tools: manifold gauge set, refrigerant recovery unit, 1/4" flare wrenches, multimeter. EPA 608 certification required. Always tag out the unit and verify zero pressure before disconnecting fittings.
• Warranty: 1-year OEM manufacturer warranty on both switches. Ships same business day from our climate-controlled warehouse.

Compatibility: Both switches are factory-specified replacements for Carrier model PH13NA04800GABAA (4-ton, single-stage heat pump). Verify refrigerant type and pressure ratings on your unit data plate before ordering. Not sure which switch you need? Our HVAC parts specialists verify fitment before you buy — in stock and ready to ship today.