OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH13NA024000ABAA

These are the factory-specified OEM high and low pressure switches for the Carrier PH13NA024000ABAA heat pump. The high pressure switch (312926-252, rated 670-470 PSI) protects the refrigerant circuit from dangerous over-pressure conditions, cutting power to the compressor before system damage can occur. The low pressure switch (312926-258, rated 55-23 PSI) monitors suction-side pressure and shuts the compressor down when pressure drops too low — a common indicator of low refrigerant, a frozen coil, or a blocked filter. Together, these two switches are the primary compressor protection layer on your Carrier heat pump. When either switch fails or trips and will not reset, the system will typically lock out on a fault code and refuse to run heating or cooling until the switch is replaced and the underlying refrigerant issue (if any) is resolved.

• High Pressure Switch Specs: Part 312926-252 | Cut-out: 670 PSI | Cut-in: 470 PSI | OEM-matched single-pole normally-closed contact | Factory Authorized Parts (FAP)
• Low Pressure Switch Specs: Part 312926-258 | Cut-out: 55 PSI | Cut-in: 23 PSI | OEM-matched single-pole normally-open contact | Factory Authorized Parts (FAP)
• OEM vs Generic: These are genuine Carrier Factory Authorized Parts — not aftermarket. OEM pressure switches are pre-calibrated to exact PSI trip points. Generic alternatives often drift ±10–15 PSI, risking compressor damage or nuisance lockouts.
• Install difficulty: 3/5 — Refrigerant circuit must be recovered before replacing high-side components. A licensed EPA 608-certified technician is required. Tools needed: manifold gauge set, torque wrench, leak detector, multimeter. Always leak-test after re-installation.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH13NA024000ABAA 2-ton heat pump. Verify your existing switch part number and PSI rating on the data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy if you have any questions. In stock and ships today.