OEM Carrier High Pressure Switch 312926-252 for Model PH3ANA024000BBAA

This OEM high pressure switch (part number 312926-252) is the factory-specified replacement for the Carrier PH3ANA024000BBAA packaged heat pump unit. The high pressure switch is a critical safety component that continuously monitors refrigerant pressure on the discharge side of the compressor. When refrigerant pressure exceeds the factory set point — due to a dirty coil, blocked airflow, refrigerant overcharge, or a failing condenser fan — the switch opens the control circuit, shutting down the compressor to prevent catastrophic damage. Common symptoms of a failed high pressure switch include repeated high-pressure fault codes, nuisance lockouts on warm days, or a system that trips off shortly after starting and requires a manual reset.

• Part Specs: OEM part number 312926-252 | High-side refrigerant pressure switch | Factory-calibrated trip point | Direct plug-in connector for Carrier PH3ANA024000BBAA
• OEM vs Generic: This OEM switch is calibrated to Carrier's exact pressure set point and trip tolerance. Generic alternatives may use wider tolerances, risking either nuisance trips or, worse, failure to protect the compressor at true over-pressure conditions.
• Install Difficulty: 3/5 — Refrigerant system work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, adjustable wrench, multimeter for continuity verification, and thread sealant. Always recover refrigerant before disconnecting the switch from the refrigerant circuit.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PH3ANA024000BBAA packaged heat pump unit. Verify your unit's model and data plate before ordering — pressure switch trip points vary by model and refrigerant type. Our fitment team is available to confirm compatibility before you buy. Order today and get same-day shipping from NationalHVACParts.com.