OEM Payne High & Low Pressure Switch Kit for Model PA13NR042000AAAA

This OEM pressure switch kit includes both the high pressure switch (HK02ZA395) and low pressure switch (HK02ZB028) factory-specified for the Payne PA13NR042000AAAA split-system air conditioner. Pressure switches monitor refrigerant circuit pressures and send a safety signal to the control board to prevent compressor and system damage. When either switch fails — or trips and won't reset — you'll typically see symptoms such as a system that won't start, shuts off immediately after startup, or trips into a fault lockout code with no obvious refrigerant leak present.

• Specs: HK02ZA395 — High Pressure Switch, factory-calibrated cutout set point | HK02ZB028 — Low Pressure Switch, factory-calibrated cutout set point | Both are OEM Carrier/Payne-series components rated for R-410A refrigerant systems | Exact pressure trip points matched to PA13NR042000AAAA factory design specifications
• OEM vs Generic: OEM pressure switches are calibrated to precise factory trip points, ensuring your system cuts out at exactly the right refrigerant pressure. Generic alternatives often carry wider tolerances, risking compressor operation outside safe pressure ranges and potentially voiding equipment warranties.
• Install difficulty: 3/5 — Refrigerant circuit must be safely isolated or recovered before replacing pressure switches. Tools needed: refrigerant manifold gauges, adjustable wrench, multimeter for continuity verification, and proper HVAC service gloves. EPA 608 certification recommended. Always verify refrigerant pressure is within normal range before condemning a switch — an underlying refrigerant issue may be the root cause.
• Warranty: 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before cutoff.

Compatibility: This kit is designed specifically for the Payne PA13NR042000AAAA 3.5-ton single-stage R-410A split-system condenser. Always verify OEM part numbers HK02ZA395 and HK02ZB028 against your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you purchase — same-day shipping available on in-stock OEM parts.