OEM Carrier High Pressure Switch 312926-252 — 670-470# for Model PH3ANA048000BBAA

This is the genuine OEM high pressure switch (part number 312926-252), factory-specified for the Carrier PH3ANA048000BBAA packaged heat pump unit. The high pressure switch is a critical safety device that monitors refrigerant discharge pressure on the high side of the refrigeration circuit. When system pressure exceeds the cut-out setpoint, the switch opens the control circuit and shuts down the compressor to prevent catastrophic damage. A failed or out-of-spec switch typically manifests as nuisance high-pressure lockouts, compressor short cycling, or a system that won't restart without a manual reset — even when refrigerant charge and airflow are correct.

• Specs: Cut-out (high) setpoint: 670 PSI | Cut-in (reset) setpoint: 470 PSI | Normally closed (NC) control circuit contact | OEM part number: 312926-252
• OEM vs Generic: This is a genuine Carrier factory-authorized part, manufactured to exact pressure setpoint tolerances. Generic or off-brand pressure switches often carry wider tolerance bands, risking either premature nuisance trips or — more dangerously — failure to open at true over-pressure conditions, which can lead to compressor failure.
• Install difficulty: 3/5 — Refrigerant system work requires an EPA Section 608 certified technician. Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, multimeter. Always recover refrigerant before replacing the switch, and verify system pressure is within spec after reinstallation before restarting the unit.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH3ANA048000BBAA packaged heat pump. Verify the 670/470 PSI pressure rating against your unit's data plate and service manual before ordering — using an incorrect setpoint switch can void your equipment warranty and create unsafe operating conditions. Our team is available to confirm fitment before you order.