OEM Carrier High & Low Pressure Switch for Model PH13NB02500GAAAA

These OEM refrigerant-circuit pressure switches are the factory-specified replacements for the Carrier PH13NB02500GAAAA heat pump condenser. The high pressure switch (312926-252) protects the system from dangerously elevated refrigerant pressure on the discharge side, while the low pressure switch (312926-258) monitors the suction side to guard against low-charge or loss-of-refrigerant conditions. When either switch fails or trips permanently, the control board will lock out the compressor, resulting in a no-cooling or no-heating fault — often accompanied by a fault code on the thermostat or board LED.

• Specs: High Pressure Switch — OEM Part 312926-252 | Low Pressure Switch — OEM Part 312926-258 | Factory-calibrated trip/reset points | Designed for R-410A refrigerant circuit | Spade terminal connections
• OEM vs Generic: OEM pressure switches are calibrated to exact factory cut-out and cut-in pressures for the PH13NB02500GAAAA refrigerant circuit. Generic alternatives may use looser tolerances, risking nuisance trips or, worse, inadequate compressor protection that shortens system life.
• Install Difficulty: 3/5 — Refrigerant-side pressure switch replacement requires safely recovering or isolating refrigerant pressure before disconnecting. Tools needed: manifold gauge set, spade terminal puller, multimeter (continuity test), and torque wrench. Recommended for licensed HVAC technicians; R-410A systems require EPA 608 certification.
• Warranty: 1-year OEM factory warranty on both switches. Orders placed by 3 PM local time ship same business day from our climate-controlled warehouse.

Compatibility: Both switches are factory-matched to the Carrier PH13NB02500GAAAA heat pump condenser. Always verify your unit's data plate and existing switch markings (trip pressure ratings) before ordering to confirm fitment. Not sure which switch failed? Our HVAC parts specialists can help you diagnose before you order — no charge.