OEM Carrier High Pressure Switch 312926-252 (670-470#) for Model PH4ANG042000BBAA

This genuine OEM high pressure switch (part #312926-252) is the factory-specified replacement for the Carrier PH4ANG042000BBAA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety control — it continuously monitors discharge-side refrigerant pressure and opens the control circuit the moment pressure exceeds the safe upper threshold, immediately cutting power to the compressor to prevent catastrophic system damage. When this switch fails or trips repeatedly, you'll typically experience nuisance lockouts, the system shutting down shortly after startup, or a fault code indicating a high-pressure trip on the control board.

• Specs: Cut-out: 670 PSIG | Cut-in: 470 PSIG | Genuine Carrier OEM part | Replaces legacy part number 312926252 | Meets EN12263 and EN60730-2-6 safety standards
• OEM vs Generic: This is a factory-authorized Carrier part manufactured to exact pressure-trip tolerances. Generic substitutes can have wider PSI variance, risking either nuisance trips or — more dangerously — failure to protect the compressor at true over-pressure conditions.
• Install difficulty: 3/5 — Refrigerant system must be recovered before replacing this switch on a live system. Tools required: manifold gauge set, refrigerant recovery machine, adjustable wrench, leak-check solution. Always follow EPA Section 608 regulations. Licensed HVAC technician strongly recommended.
• Warranty: Backed by Carrier's OEM manufacturer warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH4ANG042000BBAA packaged heat pump. Verify your existing switch's PSI ratings (670/470#) against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — just ask.