OEM Carrier High & Low Pressure Switch Kit (312926-252 / 312926-258) for Model PH14NA01800GAAAA

This factory-authorized OEM pressure switch kit includes both the 312926-252 High Pressure Switch (670/470 PSI cut-out/cut-in) and the 312926-258 Low Pressure Switch (55/23 PSI cut-out/cut-in) — the complete refrigerant circuit protection pair for the Carrier PH14NA01800GAAAA heat pump. These switches continuously monitor refrigerant pressure on both the high and low side of the refrigerant circuit. When pressures fall outside safe operating limits — due to refrigerant loss, blocked airflow, a failing TXV, or an overcharged system — the switches open the control circuit and lock out the compressor before catastrophic damage occurs. If your PH14NA01800GAAAA is tripping on fault codes related to high-pressure lockout, low-pressure lockout, or short-cycling compressor operation, one or both of these switches is the likely culprit.

• Part Numbers: 312926-252 (High Pressure Switch, 670/470# cut-out/cut-in) and 312926-258 (Low Pressure Switch, 55/23# cut-out/cut-in) | Genuine Carrier Factory Authorized Parts (FAP)
• OEM vs Generic: OEM switches are factory-calibrated to exact setpoints. Aftermarket units often drift ±10–15% from rated pressure thresholds, risking compressor damage or nuisance lockouts that a true OEM switch would prevent.
• Install Difficulty: 3/5 — Refrigerant circuit must be recovered before replacing pressure switches. Required tools: refrigerant recovery unit, manifold gauge set, 1/4" & 3/8" flare wrenches, multimeter. EPA Section 608 certification required. Always leak-test after re-installation and recharge to manufacturer specification.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: This kit is engineered specifically for the Carrier PH14NA01800GAAAA heat pump. Verify your model and serial number against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — call or chat now. Order by 3PM and your parts ship today.