OEM Carrier High & Low Pressure Switch Kit for Model PH13NA042000ABAA

These OEM Carrier pressure switches are the factory-specified replacements for the Carrier PH13NA042000ABAA heat pump. The high pressure switch (312926-252, 670-470#) monitors refrigerant discharge pressure and cuts power to the compressor if pressure rises to a dangerous level, preventing catastrophic compressor failure. The companion low pressure switch (312926-258, 55-23#) guards against low-side refrigerant loss — typically caused by a leak or restriction — shutting down the compressor before it runs dry. Together, these two switches are your system's primary refrigerant safety circuit. Symptoms of failure include the unit short-cycling, tripping a fault code, or locking out entirely with no cooling or heating output.

• High Pressure Switch Specs: Part # 312926-252 | Cut-out: 670 PSIG | Cut-in: 470 PSIG | Factory Authorized Carrier OEM part
• Low Pressure Switch Specs: Part # 312926-258 | Cut-out: 55 PSIG | Cut-in: 23 PSIG | Factory Authorized Carrier OEM part
• OEM vs Generic: OEM pressure switches are precision-calibrated to exact cut-out and cut-in set points. Aftermarket alternatives can drift ±10–15% from spec, risking nuisance trips or — worse — failure to protect the compressor under a true over-pressure event.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certified technician. Tools needed: manifold gauge set, refrigerant recovery unit, wire strippers, multimeter, and appropriate safety gear. Always recover refrigerant before replacing a pressure switch on the high-side. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty on both switches. Ships same business day from our warehouse.

Compatibility: Both switches are designed for the Carrier PH13NA042000ABAA heat pump platform. Verify your unit's data plate refrigerant type (R-410A) and model string before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order. In stock and ready to ship today.