OEM Carrier High & Low Pressure Switch Kit — 312926-252 & 312926-258 for Model PH15NB04200GBAAA

This factory-authorized OEM pressure switch kit includes both the high pressure switch (312926-252, 670/470 PSI) and the low pressure switch (312926-258, 55/23 PSI) for the Carrier PH15NB04200GBAAA heat pump. Together, these switches act as the refrigerant circuit's safety net: the high pressure switch opens the control circuit when refrigerant pressure exceeds safe limits, while the low pressure switch protects the compressor from running under a loss-of-charge or low-load condition. Common failure symptoms include nuisance lockouts, the unit short-cycling immediately after startup, or a fault code indicating a pressure trip with no obvious mechanical cause.

• Part Numbers & Ratings: High Pressure Switch — OEM #312926-252, 670 PSI cut-out / 470 PSI cut-in; Low Pressure Switch — OEM #312926-258, 55 PSI cut-out / 23 PSI cut-in | Factory-calibrated, zero field adjustment required
• OEM vs Generic: Genuine Carrier OEM switches are precision-calibrated at the factory to exact PSI thresholds. Aftermarket alternatives frequently drift ±10–15 PSI from spec, causing premature trips or — worse — failing to protect the compressor during a true overpressure event.
• Install Difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certified technician. Recover refrigerant per EPA regulations before disconnecting any pressure switch on the high-side port. Tools needed: manifold gauge set, refrigerant recovery machine, 1/4" flare wrench, multimeter. Always verify system pressures after reinstallation before returning to service.
• Warranty: 1-year OEM manufacturer warranty on both switches. Ships same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Carrier PH15NB04200GBAAA packaged heat pump. Verify your unit's data plate model number and existing switch PSI ratings before ordering — other PH15NB variants may use different pressure thresholds. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy. Order now and ship today.