OEM Carrier High Pressure Switch 670/470 PSI for Model PH3ANA042000BAAA

This is the genuine OEM Carrier high pressure switch (part number 312926-252), factory-specified for the Carrier PH3ANA042000BAAA packaged heat pump system. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors the high-side refrigerant pressure and opens the control circuit to shut down the compressor the moment pressure exceeds the safe threshold — protecting the compressor, condenser coil, and refrigerant lines from catastrophic over-pressurization damage. When this switch fails or trips and won't reset, symptoms include a system that locks out immediately on startup, a compressor that cycles off within seconds, or a system that won't run at all while displaying a high-pressure fault code.

• Specs: Cut-out pressure 670 PSIG | Auto-reset cut-in pressure 470 PSIG | OEM part number 312926-252 | Factory-certified replacement for Carrier PH3ANA042000BAAA
• OEM vs Generic: This is a genuine Carrier OEM part engineered to exact factory pressure tolerances. Off-brand switches often carry wider PSI tolerances, risking nuisance trips or — worse — failure to trip under true over-pressure conditions, which can destroy the compressor.
• Install difficulty: 3/5 — Requires EPA 608 certification to work on the refrigerant circuit. Before replacement, recover refrigerant and verify the root cause of the high-pressure fault (blocked condenser coil, overcharge, or failed condenser fan motor). Tools needed: manifold gauge set, refrigerant recovery equipment, adjustable wrench, leak detector.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PH3ANA042000BAAA packaged heat pump. Always verify part number 312926-252 against your unit's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — order today for same-day shipping.