OEM Carrier High & Low Pressure Switch Kit 312926-252 / 312926-258 for Model PH15NB02400GBBAA

These OEM Carrier refrigerant pressure switches are the factory-specified replacements for the Carrier PH15NB02400GBBAA heat pump. The high-pressure switch (312926-252, 670/470 PSI) and low-pressure switch (312926-258) are critical safety controls that continuously monitor refrigerant circuit pressure. When system pressure drifts outside the safe operating band — due to refrigerant loss, a blocked coil, or a failing TXV — these switches cut power to the compressor to prevent catastrophic damage. Typical failure symptoms include nuisance lockouts, fault codes indicating high or low pressure trips, short-cycling, or a compressor that runs briefly and then shuts off entirely.

• Specs: High-pressure switch 312926-252: 670 PSI cutout / 470 PSI cut-in | Low-pressure switch 312926-258: monitors suction-side pressure | Both rated for R-410A refrigerant systems | SPST normally-closed configuration
• OEM vs Generic: Genuine Carrier OEM switches are calibrated to exact factory trip points. Aftermarket alternatives frequently drift ±10–15% from rated thresholds, risking compressor damage or nuisance trips that are difficult to diagnose.
• Install difficulty: 3/5 — Refrigerant circuit must be recovered before replacing switches on a live system. A licensed HVAC/R technician is required for this repair. Tools needed: refrigerant recovery machine, manifold gauge set, adjustable wrench, multimeter. Always de-energize the unit before beginning work.
• Warranty: 90-day OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered as direct OEM replacements for the Carrier PH15NB02400GBBAA 2-ton R-410A heat pump. Always confirm refrigerant type and pressure ratings on your unit's data plate before ordering. Not sure if these parts fit your exact serial range? Our team verifies fitment before you order — contact us and we'll confirm in minutes.