OEM Payne High & Low Pressure Switch for Model PA13NR04800GAEAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA13NR04800GAEAA heat pump system. Pressure switches monitor refrigerant circuit pressures to protect the compressor and system components from operating outside safe pressure thresholds. When either switch fails or trips, the system will lock out before completing a heating or cooling cycle, often displaying a fault code or simply refusing to start the compressor.

• Specs: High Pressure Switch — OEM Part HK02ZA395 | Low Pressure Switch — OEM Part HK02ZB028 | Factory-calibrated W.C. rating | Direct plug-in connector for Payne PA13NR04800GAEAA | Meets all original equipment tolerances
• OEM vs Generic: OEM pressure switches are factory-calibrated to the exact cut-in and cut-out pressure thresholds for your Payne system. Generic alternatives may use broader tolerance ranges, risking nuisance trips or, worse, failure to protect the compressor under true fault conditions.
• Install difficulty: 3/5 — Refrigerant circuit work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always de-energize the unit and relieve pressure safely before disconnecting switch leads.
• Warranty: 1-year OEM factory warranty on both HK02ZA395 and HK02ZB028. Orders ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Payne PA13NR04800GAEAA 4-ton single-stage 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 and we'll get you the right part the first time.