OEM Carrier High & Low Pressure Switch Set (312926-252 & 312926-258) for PH14NA04200GBAAA

This factory-matched OEM pressure switch kit includes both the High Pressure Switch (312926-252, 670-470 PSI) and the Low Pressure Switch (312926-258) for the Carrier PH14NA04200GBAAA heat pump. Pressure switches are the refrigerant circuit's first line of defense — the high-side switch trips to protect the compressor from dangerously elevated head pressure, while the low-side switch detects loss of refrigerant charge or a blocked metering device. When either switch fails or sticks open, the system will typically lock out on a fault code, short-cycle, or refuse to enter cooling or heating mode entirely. Replacing both switches together eliminates diagnostic guesswork and ensures the full refrigerant protection circuit is restored to factory specification.

• Specs — High Pressure Switch (312926-252): Cut-out 670 PSIG | Reset 470 PSIG | Factory-calibrated SPST-NC | Rated for R-410A refrigerant systems | Schrader-port connection
• Specs — Low Pressure Switch (312926-258): Factory OEM set-points matched to Carrier PH14NA04200GBAAA refrigerant circuit | SPST-NC | Compatible with R-410A operating pressures
• OEM vs Generic: Genuine Carrier OEM switches ship pre-calibrated to exact factory cut-out and reset pressures. Aftermarket alternatives frequently carry ±10–15% pressure tolerance, risking nuisance trips or, worse, compressor damage from inadequate protection. Always use OEM on R-410A systems where head pressures can spike above 600 PSIG on hot days.
• Install Difficulty: 3/5 — Refrigerant circuit work requires an EPA 608 certification. Recover refrigerant before disconnecting any Schrader-mounted switch. Tools needed: manifold gauge set, Schrader valve core tool, adjustable wrench, leak detector. Torque fittings to manufacturer specification to prevent refrigerant loss.
• Warranty: 1-year OEM manufacturer warranty. Both switches ship same business day from our warehouse — no split orders, no delays.

Compatibility: Engineered specifically for the Carrier PH14NA04200GBAAA 4-ton R-410A heat pump (PH14NA series). Verify OEM part numbers 312926-252 (high) and 312926-258 (low) against your unit's service label before ordering. If you need fitment confirmed, our HVAC parts specialists are available to verify compatibility before your order ships — same-day shipping on all in-stock orders.