OEM Payne High & Low Pressure Switch for Model PA10JA03600MACAA

This OEM pressure switch is the factory-specified replacement for the Payne PA10JA03600MACAA packaged air conditioning unit. The pressure switch monitors refrigerant pressure on both the high and low sides of the system to protect the compressor from damaging over-pressure or loss-of-charge conditions. When either switch fails, the system will typically lock out on a fault code, refuse to start the compressor, or cycle off unexpectedly — leaving you with no cooling and a flashing fault LED on the control board.

• Specs: Includes High Pressure Switch (OEM Part HK02ZA395) and Low Pressure Switch (OEM Part HK02ZB028) | Factory-calibrated cut-out setpoints | SPST normally-closed contacts | Designed for R-410A refrigerant systems
• OEM vs Generic: OEM pressure switches are calibrated to exact factory setpoints, ensuring reliable compressor protection. Aftermarket switches often carry wider tolerance bands that can allow compressor operation outside safe pressure limits, risking costly compressor failure.
• Install Difficulty: 3/5 — Refrigerant system work requires EPA 608 certification. Tools needed: manifold gauge set, adjustable wrench, multimeter, safety glasses. Always recover refrigerant before replacing the switch. Photograph all wiring connections before disconnecting. Confirm system is de-energized before starting work.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM ship same business day from our warehouse.

Compatibility: Engineered specifically for the Payne PA10JA03600MACAA packaged unit (3-ton R-410A configuration). Verify your existing switch part number — HK02ZA395 (high side) or HK02ZB028 (low side) — against your unit's wiring diagram before ordering. If you're unsure which switch has failed, our HVAC parts specialists can help confirm fitment before you buy. In-stock and ready to ship today.