OEM Carrier High Pressure Switch 670/470 PSI — Part 312926-252 for Model PH4ANG030000BAAA

This OEM high pressure switch (part #312926-252) is the factory-specified safety control for the Carrier PH4ANG030000BAAA packaged heat pump. Its job is critical: it continuously monitors refrigerant pressure on the high side of the refrigerant circuit and cuts out the compressor the instant pressure exceeds the safe threshold. Without a properly functioning high pressure switch, a refrigerant blockage, failed condenser fan motor, or overcharge condition can destroy your compressor — a repair that costs 10–20× more than this switch. Common failure symptoms include nuisance high-pressure lockout faults, the system short-cycling on hot days, or a fault code indicating a high-pressure trip with no obvious refrigerant issue.

• Specs: Cut-out: 670 PSI | Cut-in (auto-reset): 470 PSI | OEM Part Number: 312926-252 | Factory-matched pressure thresholds for R-410A systems
• OEM vs Generic: This is a genuine Carrier OEM part with factory-calibrated cut-out and cut-in setpoints. Generic pressure switches often carry wider PSI tolerances that can allow unsafe operating pressures or cause nuisance trips — either outcome risks compressor damage or failed warranty claims.
• Install difficulty: 3/5 — Refrigerant circuit must be recovered before accessing the high-side port. Tools required: manifold gauge set, adjustable wrench, wire crimpers/connectors, multimeter. Installation by an EPA 608-certified technician is strongly recommended. Always verify system pressure readings after replacement.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier PH4ANG030000BAAA packaged heat pump units. Always cross-reference the part number on your existing switch and confirm your unit's refrigerant type before ordering. Our fitment team is available to verify compatibility before you buy — no guesswork required.