OEM Carrier High Pressure Switch 670/470 PSI for Model PH4ANG036000BAAA

This is the genuine OEM high pressure switch (part number 312926-252), factory-specified for the Carrier PH4ANG036000BAAA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors system discharge pressure and trips the compressor offline when pressure climbs above the safe cut-out threshold — preventing catastrophic compressor failure, refrigerant line rupture, or heat exchanger damage. If your unit is experiencing nuisance high-pressure lockouts, compressor short-cycling, or simply won't run after a fault code is displayed, a failed or out-of-calibration pressure switch is one of the most common culprits.

• Specs: Cut-out: 670 PSI | Cut-in: 470 PSI | Refrigerant-side high-side monitoring | Factory-matched trip points per Carrier engineering tolerances
• OEM vs Generic: OEM pressure switches are calibrated to exact PSI thresholds at the factory. Generic aftermarket switches can carry ±10–15% PSI tolerances, leading to premature trips, missed fault conditions, or unprotected compressor operation — none of which you want.
• Install difficulty: 3/5 — Refrigerant system work requires an EPA 608 certification. A licensed HVAC technician must recover refrigerant, swap the switch on the high-side service port, recharge, and verify operation with a manifold gauge set. Do not attempt without proper certification and equipment.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH4ANG036000BAAA 3-ton packaged heat pump unit. Always verify the part number on your existing switch label and confirm model and serial number before ordering. Our team is available to verify fitment — contact us before you buy if you have any questions.