OEM Carrier High Pressure Switch 448#OPN / 327#CLS for Model PY1REA048115AAWB

This is the factory OEM high pressure switch (part number HK02ZA442) for the Carrier PY1REA048115AAWB packaged unit. The high pressure switch is a critical refrigerant-circuit safety device that monitors system discharge pressure. When refrigerant pressure rises beyond the factory-set limit, the switch opens the circuit to protect the compressor from catastrophic damage. Symptoms of a failed high pressure switch include nuisance high-pressure lockouts, the unit shutting off shortly after startup, or a system that will not call for cooling at all. A companion low pressure switch (HK02ZB044) is also available and frequently replaced at the same time.

• Specs: Opens at 448 PSI | Closes at 327 PSI | 24V control circuit compatible | Factory-matched trip and reset points | OEM Part Numbers: HK02ZA442 (High Pressure), HK02ZB044 (Low Pressure)
• OEM vs Generic: This is a genuine Carrier OEM part, manufactured to exact factory pressure tolerances. Aftermarket pressure switches frequently carry wider trip-point tolerances, which can lead to compressor damage from undetected over-pressure conditions.
• Install difficulty: 3/5 — Refrigerant-side component. EPA 608 certification required to recover/recharge refrigerant if the switch is in the high-side line. Tools needed: manifold gauge set, service wrench, multimeter to confirm continuity after swap. Always verify system pressure before reinstalling panels.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered specifically for the Carrier PY1REA048115AAWB packaged unit. Replaces OEM part number HK02ZA439. Verify the pressure rating on your unit's data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase — call or chat today and get your system back online fast.