OEM Carrier High Pressure Switch 670/470 PSI for Model PH4ANG018000BBAA

This is the genuine OEM high pressure switch (part number 312926-252), factory-specified for the Carrier PH4ANG018000BBAA packaged heat pump unit. The high pressure switch is a critical refrigerant-circuit safety device: it continuously monitors system high-side pressure and cuts power to the compressor if pressure exceeds the safe operating threshold. When this switch fails or trips on a fault, symptoms include nuisance lockouts, compressor short-cycling, fault codes on the control board, or the system failing to cool or heat altogether. Replacing it with the correct OEM part ensures the safety logic operates exactly as Carrier engineered it.

• Specs: 670 PSI cutout / 470 PSI reset | Factory OEM tolerance | Spade terminal connections | Rated for R-410A refrigerant systems
• OEM vs Generic: This is a genuine Carrier factory part. Generic pressure switches often use lower-grade diaphragms with inconsistent trip points, leading to false trips or — worse — failure to open under true overpressure conditions. The OEM part is the only way to guarantee the safety threshold is exactly right for your system.
• Install difficulty: 3/5 — High pressure switch replacement requires recovering refrigerant if the switch is in a sealed circuit. Always recover refrigerant per EPA Section 608 requirements before opening the system. Tools needed: refrigerant recovery machine, manifold gauges, 1/4" nut driver, spade terminal puller. Licensed HVAC technician strongly recommended.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse.

Compatibility: Direct OEM replacement for the Carrier PH4ANG018000BBAA packaged heat pump unit. Verify part number 312926-252 against your unit's data plate and wiring diagram before ordering. Our parts specialists are available to confirm fitment — don't guess on a safety-critical component. Order by 3 PM and this part ships today.