OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for Model PH15NA030000BAAA

These factory OEM pressure switches are the certified replacement components for the Carrier PH15NA030000BAAA heat pump. The high pressure switch (312926-252, 670-470 PSI) monitors refrigerant discharge pressure and cuts power to the compressor if pressure exceeds safe operating limits — protecting the compressor from catastrophic failure. The low pressure switch (312926-258) monitors suction-side refrigerant pressure and shuts the system down under low-charge or evaporator-freeze conditions. Together, they are the primary refrigerant circuit safety net of your heat pump. Common failure symptoms include nuisance high-pressure lockouts, fault codes on the control board, the system short-cycling, or the compressor refusing to start even after a manual reset.

• Part Numbers: High Pressure Switch — 312926-252 (670 open / 470 close PSI) | Low Pressure Switch — 312926-258 | Both are genuine Carrier OEM factory-authorized parts.
• OEM vs Generic: OEM pressure switches use factory-calibrated trip points to ±2% tolerance. Aftermarket alternatives frequently drift outside spec, causing false lockouts or — more dangerously — failing to trip when refrigerant pressure is genuinely unsafe, risking compressor damage.
• Install Difficulty: 3/5 — Refrigerant system work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, recovery equipment, adjustable wrench, wire strippers, multimeter. Always verify refrigerant charge after replacing switches to rule out underlying system issues.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered exclusively for the Carrier PH15NA030000BAAA heat pump. Verify both part numbers against your unit's wiring diagram before ordering — high and low pressure switches are not interchangeable. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.