OEM Payne High & Low Pressure Switch for Model PA13PR04800GACAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA13PR04800GACAA packaged heat pump unit. Pressure switches monitor refrigerant pressure on both the high and low sides of the refrigerant circuit, protecting the compressor from damage caused by abnormal operating pressures. When either switch fails or trips, the system will typically lock out, preventing startup entirely or shutting down mid-cycle to protect the compressor from catastrophic damage.

• Specs: HK02ZA395 — High-Side Pressure Switch | HK02ZB028 — Low-Side Pressure Switch | Factory-calibrated set points | Designed for R-410A refrigerant systems | Direct OEM replacement, no modification required
• OEM vs Generic: OEM pressure switches are calibrated to exact factory cut-in and cut-out pressure thresholds. Generic alternatives often carry wider tolerances, risking nuisance trips or — more critically — failing to protect the compressor under true fault conditions.
• Install difficulty: 3/5 — Refrigerant pressure must be verified with gauges before condemning a pressure switch. Tools needed: manifold gauge set, multimeter, adjustable wrench, and safety gloves. Always recover refrigerant per EPA 608 regulations before disconnecting refrigerant-side switches. Electrical disconnect is recommended before any work begins.
• Warranty: 1-year OEM factory warranty on both HK02ZA395 and HK02ZB028. In-stock units ship same business day from our warehouse.

Compatibility: Engineered specifically for the Payne PA13PR04800GACAA 4-ton packaged heat pump. Confirm OEM part numbers HK02ZA395 and HK02ZB028 against your unit's data plate or wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork required. Order today and get same-day shipping on in-stock OEM parts.