OEM Carrier High Pressure Switch 670/470 PSI for Model PH3ANA018000BAAA

This is the genuine OEM Carrier high pressure switch (part number 312926-252), factory-specified for the PH3ANA018000BAAA packaged heat pump unit. The high pressure switch is a critical refrigerant-side safety control that continuously monitors system pressure. When refrigerant pressure exceeds the safe operating threshold of 670 PSI, the switch opens the circuit and shuts down the compressor to prevent catastrophic system damage. It automatically resets at 470 PSI once pressure normalizes. Common failure symptoms include nuisance high-pressure lockouts, the system short-cycling without obvious cause, or a fault code indicating a high-pressure trip on the unit's control board.

• Specs: Cutout pressure: 670 PSI | Reset pressure: 470 PSI | OEM Part Number: 312926-252 | Genuine Carrier Factory Authorized Part
• OEM vs Generic: This is a factory OEM component built to exact Carrier pressure tolerances. Aftermarket switches can drift in calibration, causing nuisance trips or — more dangerously — failing to trip at all, risking compressor burnout.
• Install difficulty: 3/5 — Refrigerant-side component. System must be recovered before replacement per EPA Section 608 regulations. Tools needed: manifold gauge set, refrigerant recovery unit, adjustable wrench, leak-detection solution. Licensed HVAC technician strongly recommended.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Verified fit for Carrier model PH3ANA018000BAAA packaged heat pump. Always confirm refrigerant type and pressure ratings against your unit's data plate before ordering. Our parts specialists are available to verify fitment — contact us before you order if you have any questions.