OEM Payne High & Low Pressure Switch Set for Model PA13NR048000AHAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA13NR048000AHAA split-system heat pump. Pressure switches monitor refrigerant-side pressures to protect the compressor from operating outside safe limits. When either switch fails or trips, the system will lock out on a fault code, preventing heating or cooling operation entirely. Common symptoms include the unit failing to start, short-cycling, or displaying a pressure fault on the thermostat or control board.

• Specs: HK02ZA395 — High Pressure Switch | HK02ZB028 — Low Pressure Switch | Factory-calibrated trip points | OEM-matched electrical connectors for direct plug-in replacement
• OEM vs Generic: OEM pressure switches are calibrated to exact factory trip-point thresholds. Generic alternatives often carry wider tolerances, risking nuisance trips or, worse, failing to protect the compressor during a true high- or low-pressure event.
• Install difficulty: 3/5 — Refrigerant system work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, screwdrivers, needle-nose pliers, multimeter. Always recover refrigerant and relieve system pressure before replacing pressure switches. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM factory warranty on both switches. Orders placed by cutoff ship the same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Payne PA13NR048000AHAA 4-ton single-stage R-410A split-system heat pump. Cross-reference OEM part numbers HK02ZA395 and HK02ZB028 against your unit's data plate and wiring diagram before ordering. Our parts specialists are available to verify fitment prior to purchase — your satisfaction is guaranteed.