OEM Carrier High & Low Refrigerant Pressure Switch Kit for Model PH15NB01800GBBAA

This OEM-matched kit includes both the high pressure switch (312926-252) and the low pressure switch (312926-258) factory-specified for the Carrier PH15NB01800GBBAA packaged heat pump unit. Refrigerant-side pressure switches are critical safety and operational components: the high-side switch protects the compressor from dangerously elevated discharge pressure, while the low-side switch guards against loss of refrigerant charge or evaporator freeze-up. Common failure symptoms include nuisance lockouts, compressor short-cycling, error codes indicating a pressure fault, or the system refusing to enter heating or cooling mode entirely.

• Specs: High Pressure Switch OEM Part 312926-252 | Low Pressure Switch OEM Part 312926-258 | Factory-calibrated cut-out and cut-in setpoints | Direct plug-in OEM connector — no splicing required
• OEM vs Generic: OEM pressure switches are calibrated to Carrier's exact pressure thresholds for R-410A systems. Aftermarket alternatives often carry wider setpoint tolerances, risking compressor damage or nuisance trips that generic parts cannot reliably prevent.
• Install difficulty: 3/5 — Refrigerant system work requires EPA 608 certification. Tools needed: manifold gauge set, torque wrench, multimeter for continuity verification, and refrigerant recovery equipment. Always recover refrigerant before replacing low-side switch; high-side switch replacement also requires system depressurization.
• Warranty: 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before cut-off.

Compatibility: This kit is designed for the Carrier PH15NB01800GBBAA 1.5-ton packaged heat pump unit. Verify your unit's data plate and existing switch part numbers before ordering to confirm fitment. Bundling both switches ensures a complete refrigerant-circuit pressure protection restore in a single service call — eliminating callbacks. Questions about fitment? Our HVAC parts specialists verify compatibility before you order.