OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for Model PH13NB036000AAAA

This 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 factory-specified refrigerant safety controls for the Carrier PH13NB036000AAAA heat pump. These switches continuously monitor refrigerant circuit pressure and cut power to the compressor the instant pressure goes out of the safe operating window. A failed high pressure switch typically causes nuisance high-pressure lockouts, error codes, or a system that trips off on hot days. A failed low pressure switch causes the unit to shut down on startup or during low ambient conditions, often mimicking a refrigerant leak symptom. Replacing both switches together is best practice — if one has drifted out of calibration, the other is likely close behind.

• Specs — High Pressure Switch (312926-252): Cut-out 670 PSI | Cut-in 470 PSI | SPST Normally Closed | Factory-calibrated for R-410A systems
• Specs — Low Pressure Switch (312926-258): Cut-out 55 PSI | Cut-in 23 PSI | SPST Normally Closed | Sensata PS80-02-F1270 platform
• OEM vs Generic: OEM switches are factory-calibrated to exact cut-in/cut-out PSI tolerances. Aftermarket switches frequently drift ±10–15 PSI from spec, causing nuisance trips or — worse — failing to protect the compressor during a true overpressure event. Always use OEM on R-410A systems.
• Install difficulty: 3/5 — Refrigerant circuit must be de-energized before disconnection. Tools needed: refrigerant manifold gauge set, 1/4" flare wrench, multimeter for continuity check, and electrical tape. A licensed HVAC technician is strongly recommended. Photograph all wiring connections before removal.
• Warranty: 1-year OEM manufacturer warranty from date of purchase. Ships same business day from our warehouse stock.

Compatibility: Engineered for the Carrier PH13NB036000AAAA (3-ton, single-stage R-410A heat pump). Verify your unit's data plate and existing switch PSI ratings before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you purchase — contact us before ordering. In stock now — order by 3 PM local time for same-day shipping.