OEM Payne High & Low Pressure Switch Set for Model PA13NR030000AEAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA13NR030000AEAA split-system heat pump. Pressure switches monitor refrigerant pressure on both the high and low sides of the refrigerant circuit, signaling the control board to shut down operation if pressures fall outside safe operating ranges. When either switch fails, the system will typically lock out before completing a heating or cooling cycle, display a fault code, or short-cycle repeatedly without delivering conditioned air.

• Specs: HK02ZA395 — High Side Pressure Switch | HK02ZB028 — Low Side Pressure Switch | Factory-calibrated setpoints | Direct OEM replacement, no wiring modifications required
• OEM vs Generic: OEM pressure switches are calibrated to the exact factory cutout and reset pressures for this unit. Generic substitutes often use looser tolerances, leading to nuisance trips or — worse — failure to protect the compressor from damaging pressure events.
• Install difficulty: 3/5 — Refrigerant system work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, flathead screwdriver, needle-nose pliers, multimeter. Always recover refrigerant before replacing switches on the high-side port. Low-side switch may be accessible without full recovery depending on system pressure state.
• Warranty: 1-year OEM factory warranty on both switches. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: This listing covers both the high and low pressure switches for the Payne PA13NR030000AEAA 2.5-ton single-stage R-410A split-system heat pump. Verify OEM part numbers HK02ZA395 and HK02ZB028 against your unit's wiring diagram and data plate before ordering. Not sure which switch you need? Our HVAC parts specialists can confirm fitment — contact us before you order.