OEM Carrier High Pressure Switch 670/470 PSI for Model PH3ANA048000BAAA

This is the genuine OEM high pressure switch (part number 312926-252), factory-specified for the Carrier PH3ANA048000BAAA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety control that continuously monitors discharge-side pressure. When refrigerant pressure rises above the 670 PSI cutout threshold — due to a dirty condenser coil, failed condenser fan, refrigerant overcharge, or blocked airflow — the switch opens the control circuit, shutting the compressor down to prevent catastrophic damage. The system resets (or locks out, depending on board configuration) once pressure drops back to the 470 PSI cut-in set point. Ignoring a tripped high pressure switch almost always leads to compressor failure, making a fast, accurate replacement critical.

• Specs: Cutout: 670 PSI | Cut-in (reset): 470 PSI | OEM Part Number: 312926-252 | Genuine Carrier Factory Authorized Part
• OEM vs Generic: OEM switches are calibrated to exact factory PSI tolerances. Off-brand substitutes frequently drift in set points, risking either nuisance trips or — worse — failing to protect the compressor at all.
• Install difficulty: 3/5 — Refrigerant circuit work requires EPA 608 certification. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, leak detector. Always recover refrigerant before removing the switch and pressure-test after reinstallation.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH3ANA048000BAAA 4-ton packaged heat pump unit. Verify your unit's data plate lists OEM part number 312926-252 before ordering. Our technical team is available to confirm fitment — just reach out before you buy.