OEM Carrier High Pressure Switch 670/470 PSI for Model PH3ANA036000BBAA

This is the factory OEM high pressure switch (part number 312926-252) for the Carrier PH3ANA036000BBAA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety control that continuously monitors system discharge pressure. When refrigerant pressure climbs above the factory cutout threshold — due to a dirty condenser coil, failed condenser fan motor, refrigerant overcharge, or restricted airflow — the switch opens the control circuit and shuts down the compressor to prevent catastrophic system damage. Symptoms of a failed or nuisance-tripping high pressure switch include sudden system lockout, compressor short-cycling, or an error code indicating high-pressure fault on the board.

• Specs: Cutout: 670 PSIG | Reset: 470 PSIG | Automatic reset | Factory-matched safety tolerances for R-410A refrigerant systems
• OEM vs Generic: OEM switches are calibrated to exact Carrier factory cutout and reset pressures. Aftermarket alternatives may trip at incorrect thresholds, causing premature lockouts or — worse — failing to protect the compressor at dangerous pressures.
• Install difficulty: 3/5 — Refrigerant circuit work requires an EPA Section 608 certified technician. Tools needed: manifold gauge set, torque wrench, leak detector. Always recover refrigerant before opening the high-side circuit. Verify system pressures after reinstallation.
• 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 model PH3ANA036000BBAA. Verify the 670/470 PSI cutout/reset rating against your unit's data plate and wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — no guesswork required.