OEM Carrier High & Low Pressure Switch Set (312926-252 & 312926-258) for Model PH15NB03000GBBAA

This factory-matched OEM pressure switch kit includes both the 312926-252 High Pressure Switch (670/470 PSI cut-out/cut-in) and the 312926-258 Low Pressure Switch (55/23 PSI cut-out/cut-in) — the two refrigerant safety controls specified for the Carrier PH15NB03000GBBAA heat pump. These switches continuously monitor refrigerant pressure on both the high and low sides of the refrigeration circuit. When pressure strays outside safe operating limits, the switch opens the control circuit, shutting down the compressor before damage can occur. Common failure symptoms include nuisance lockouts, the unit short-cycling, a fault code indicating high or low pressure, or the compressor refusing to run even with good refrigerant charge.

• Specs — High Pressure Switch (312926-252): Cut-out 670 PSIG | Cut-in 470 PSIG | SPST-NC | Rated for R-410A | Factory Authorized Part
• Specs — Low Pressure Switch (312926-258): Cut-out 55 PSIG | Cut-in 23 PSIG | SPST-NC | Rated for R-410A | Factory Authorized Part
• OEM vs Generic: OEM Carrier pressure switches are factory-calibrated to exact cut-out and cut-in pressures for the PH15NB03000GBBAA refrigerant circuit. Generic aftermarket switches frequently carry ±10–15% PSI tolerances, which can trigger nuisance trips or — worse — allow the compressor to operate outside safe pressure windows, accelerating wear or voiding warranty.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certified technician. Tools needed: manifold gauge set, wire terminals/crimpers, multimeter, and service literature for the PH15NB03000GBBAA. Always recover refrigerant per EPA regulations before replacing switches located on the refrigerant circuit. Verify wiring polarity before reconnecting.
• Warranty: 1-year OEM manufacturer warranty. Both switches ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH15NB03000GBBAA heat pump. Verify your unit's data plate refrigerant type (R-410A) and confirm both OEM part numbers — 312926-252 and 312926-258 — against your existing switches before ordering. Not sure it fits? Contact our team and we'll verify fitment before you purchase. In stock — order by 3 PM and ships today.