OEM Carrier High & Low Pressure Switch Set (312926-252 / 312926-258) for Model PH15NA02400GBAAA

This factory-matched OEM pressure switch set includes both the 312926-252 High Pressure Switch (670-470 psi) and the 312926-258 Low Pressure Switch (55-23 psi) — the two refrigerant-circuit safety switches specified by Carrier for the PH15NA02400GBAAA heat pump. These switches continuously monitor refrigerant pressure on both the high and low side of the refrigeration circuit. When pressure drifts outside safe operating limits, the switch opens the control circuit, triggering a system lockout to protect the compressor from catastrophic failure. Symptoms of a failed pressure switch include: system locking out on fault codes, short-cycling within the first few minutes of operation, or a unit that runs the inducer/fan but never stages on cooling or heating.

• Specs — High Pressure Switch (312926-252): Cut-out 670 psi | Cut-in 470 psi | Factory Authorized OEM Part | Manufacturer: Sensata / Carrier RCD
• Specs — Low Pressure Switch (312926-258): Cut-out 55 psi | Cut-in 23 psi | Pre-wired leads | Brass inlet connector | Precision-calibrated diaphragm
• OEM vs Generic: OEM pressure switches are factory-calibrated to exact cut-in/cut-out tolerances for the PH15NA02400GBAAA refrigerant circuit. Generic switches frequently carry ±10–15% pressure tolerances, which can allow nuisance lockouts or — worse — allow the compressor to run under damaging conditions.
• Install difficulty: 3/5 — Refrigerant system must be recovered before replacing pressure switches on the high-side port. Tools needed: manifold gauge set, refrigerant recovery machine, adjustable wrench, multimeter (to verify open/close at rated pressures), and Schrader valve core tool. Always verify proper refrigerant charge after reinstallation. Licensed HVAC technician required in most jurisdictions.
• Warranty: 1-year OEM factory warranty on both switches. Ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PH15NA02400GBAAA heat pump units. Verify your unit's data plate and fault code history before ordering — both switches are included in this listing. If you only need one switch, contact our team for individual pricing. Questions about fitment? Our HVAC parts specialists verify compatibility before you order. In stock — ships today.