OEM Payne High & Low Pressure Switch for Model PA12NA042000ABAA

These are the factory-specified OEM replacement pressure switches for the Payne PA12NA042000ABAA packaged air conditioning unit. The pressure switch proves that refrigerant pressure is within safe operating limits before allowing the system to run. A failed high or low pressure switch will cause the unit to lock out on a fault code — typically resulting in no cooling, a blinking LED fault sequence, or a system that trips immediately after startup. If your Payne unit refuses to run or trips repeatedly, a faulty pressure switch is a common culprit.

• Specs: Includes two switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) | Factory-calibrated setpoints for R-410A refrigerant | Spade terminal connectors | OEM-matched tolerances for accurate fault detection
• OEM vs Generic: OEM pressure switches are calibrated to exact factory cutout and reset pressures. Generic alternatives often deviate from spec, risking nuisance trips or — more dangerously — failure to protect the compressor from damaging pressure extremes.
• Install difficulty: 3/5 — Requires recovery of refrigerant before replacing pressure switches on a live system. Tools needed: manifold gauge set, refrigerant recovery machine, needle-nose pliers, multimeter, and wire labels. Always de-energize the unit and follow EPA Section 608 refrigerant handling regulations before proceeding.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Payne PA12NA042000ABAA packaged air conditioning unit. Always verify your existing switch part numbers — HK02ZA395 for the high-side switch and HK02ZB028 for the low-side switch — against your unit's wiring diagram or data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you purchase. In stock — order now and ships today.