OEM Payne High & Low Pressure Switch for Model PA13NR03000GAEAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA13NR03000GAEAA split-system heat pump. Pressure switches monitor refrigerant circuit pressures on both the high and low sides to protect the compressor from operating outside safe pressure limits. When either switch fails or trips, the system will lock out, preventing compressor operation and leaving you with no heating or cooling. Common symptoms include the system short-cycling, failing to start entirely, or triggering a fault code on your thermostat or control board.

• Specs: HK02ZA395 — High Side Pressure Switch | HK02ZB028 — Low Side Pressure Switch | Factory-calibrated trip points | Direct OEM replacement for Payne PA13NR03000GAEAA heat pump systems
• OEM vs Generic: OEM pressure switches are calibrated to exact factory trip-point specifications, ensuring reliable compressor protection. Generic substitutes often carry wider pressure tolerances, risking nuisance trips or — worse — allowing the compressor to run outside safe operating limits.
• Install Difficulty: 3/5 — Refrigerant circuit work may require an EPA 608-certified technician. Tools needed: manifold gauge set, multimeter, flat-head screwdriver, and needle-nose pliers. Always recover refrigerant per EPA regulations before replacing pressure switches on the refrigerant lines.
• Warranty: 1-year OEM factory warranty on both HK02ZA395 and HK02ZB028. Orders ship same business day from our warehouse.

Compatibility: Designed specifically for the Payne PA13NR03000GAEAA split-system heat pump. Verify your existing switch part numbers (HK02ZA395 or HK02ZB028) against your unit's data plate and wiring diagram before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back up and running fast.