OEM Payne High & Low Pressure Switch Set for Model PA13NR02400GACAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA13NR02400GACAA heat pump system. Pressure switches monitor refrigerant circuit pressures to protect the compressor from operating under unsafe high- or low-pressure conditions. When either switch fails or trips, the system will lock out, preventing the compressor from starting and potentially triggering a fault code on your thermostat or control board. Common symptoms include the system refusing to cool or heat, repeated short-cycling, or a compressor that hums but won't run.

• Specs: HK02ZA395 — High Pressure Switch (opens on high-side over-pressure) | HK02ZB028 — Low Pressure Switch (opens on low-side under-pressure) | Factory-calibrated trip points matched to R-410A operating range | Spade terminal connections for direct OEM plug-in fit
• OEM vs Generic: OEM pressure switches are calibrated to exact factory trip-point specifications for the PA13NR02400GACAA. Generic alternatives may use broader pressure tolerances, risking nuisance trips or, worse, failing to protect the compressor under genuine fault conditions.
• Install difficulty: 3/5 — Refrigerant circuit work should be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, multimeter, flat-head and Phillips screwdrivers, wire stripper. Always de-energize the unit and verify pressure is equalized before disconnecting switch fittings. Photograph all wiring connections prior to removal.
• Warranty: 1-year OEM factory warranty on both switches. Orders ship same business day from our warehouse when placed before 3 PM local time.

Compatibility: This listing covers both the high and low pressure switches for the Payne PA13NR02400GACAA 2-ton, single-stage R-410A heat pump. Always confirm OEM part numbers HK02ZA395 and HK02ZB028 against your unit's data plate and wiring diagram before ordering. Our fitment team is available to verify compatibility — reach out before you order if you have any questions. In stock and ready to ship today.