OEM Carrier High & Low Pressure Switch Kit — 312926-252 / 312926-258 for Model PH15NA024000BAAA

These OEM pressure switches are the factory-specified safety controls for the Carrier PH15NA024000BAAA heat pump. The high pressure switch (312926-252) monitors refrigerant discharge pressure and cuts power to the compressor if pressure exceeds the safe upper threshold (670 PSI cut-out / 470 PSI cut-in), preventing catastrophic compressor failure. The low pressure switch (312926-258) monitors suction-side pressure and shuts down the system if pressure drops too low — a common indicator of refrigerant loss or a blocked metering device. Together, they form the primary refrigerant-side protection circuit. When either switch fails or sticks open, you'll typically see the system go into a hard lockout, flash a fault code, or short-cycle repeatedly without cooling.

• OEM Part Numbers: 312926-252 (High Pressure Switch, 670/470 PSI) | 312926-258 (Low Pressure Switch) — Genuine Carrier factory components meeting exact design specifications
• OEM vs Generic: OEM switches use factory-calibrated set-points and rated electrical contacts. Aftermarket substitutes often carry wider pressure tolerances, risking either nuisance trips or — more dangerously — failure to protect the compressor under true over-pressure conditions.
• Install Difficulty: 3/5 — Refrigerant system work. The system must be recovered before replacing either switch if refrigerant lines must be opened. Tools needed: manifold gauge set, refrigerant recovery machine, adjustable wrench, and a multimeter to verify switch continuity before re-commissioning. Licensed EPA 608-certified technician strongly recommended.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PH15NA024000BAAA heat pump platform. Always verify against your unit's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.