OEM Carrier High & Low Pressure Switch for Model PH13NA03000GABAA

This factory-original pressure switch kit includes both the high pressure switch (312926-252) and the low pressure switch (312926-258) designed as direct OEM replacements for the Carrier PH13NA03000GABAA heat pump. Pressure switches are safety devices that monitor refrigerant pressure on both the high-side and low-side of the refrigerant circuit. When refrigerant pressure falls outside the safe operating range — due to low charge, refrigerant leaks, blocked coils, or compressor issues — the pressure switch opens the circuit and shuts the system down to prevent compressor damage. Common symptoms of a failed pressure switch include: the system going into lockout after startup, short-cycling within seconds of compressor engagement, or a no-cooling/no-heating condition with no other obvious cause.

• Specs: Includes High Pressure Switch OEM Part # 312926-252 and Low Pressure Switch OEM Part # 312926-258 | Factory-calibrated pressure trip points | Direct plug-in connector | Designed for R-410A refrigerant systems
• OEM vs Generic: OEM Carrier pressure switches are factory-calibrated to exact trip-point thresholds for the PH13NA03000GABAA refrigerant circuit. Generic alternatives may use wider tolerance trip points, risking nuisance lockouts or — more critically — failure to protect the compressor under abnormal pressure conditions.
• Install Difficulty: 3/5 — Refrigerant system must be evaluated by a licensed HVAC technician before replacing pressure switches, as a failed switch may indicate an underlying refrigerant charge or airflow issue. Tools needed: multimeter (continuity test), flathead screwdriver, needle-nose pliers. Always disconnect power at the disconnect box before servicing.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: These pressure switches are factory-specified for the Carrier PH13NA03000GABAA heat pump. Always verify OEM part numbers 312926-252 and 312926-258 against your unit's wiring diagram or data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — contact us before ordering.