OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH13NA048000ABAA

These two OEM pressure switches are the factory-authorized replacements for the Carrier PH13NA048000ABAA heat pump. The high pressure switch (312926-252, 670/470 PSI) protects the compressor by cutting power when refrigerant pressure climbs dangerously high — typically triggered by a blocked condenser coil, failed fan motor, or refrigerant overcharge. The low pressure switch (312926-258, 55/23 PSI) guards against low-side conditions such as refrigerant undercharge or a restricted metering device, preventing compressor damage from vapor slugging. When either switch fails or trips without reset, the system will lock out, short-cycle, or fail to cool/heat entirely.

• Part Numbers: 312926-252 (High Pressure Switch, 670/470 PSI cutout/reset) | 312926-258 (Low Pressure Switch, 55/23 PSI cutout/reset) | Factory Authorized OEM Carrier parts
• OEM vs Generic: OEM switches are factory-calibrated to exact PSI setpoints for the PH13NA048000ABAA refrigerant circuit. Aftermarket alternatives often carry ±10–15% pressure tolerance drift, risking nuisance trips or — worse — inadequate compressor protection.
• Install Difficulty: 3/5 — Requires recovery of R-410A refrigerant before accessing the refrigerant circuit. Tools needed: manifold gauge set, recovery machine, torque wrench, multimeter. EPA 608 certification required. Always confirm system pressure before declaring a switch faulty vs. a true refrigerant charge issue.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH13NA048000ABAA packaged heat pump unit. Verify both PSI ratings and connector type against your unit's wiring diagram before ordering. Buying both switches together ensures complete high/low-side protection and eliminates a return visit. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — in stock and ships today.