OEM Payne Low Pressure Switch HK02ZB028 for Model PA13NR06000GAJAA

This OEM low pressure switch (part number HK02ZB028) is the factory-specified replacement for the Payne PA13NR06000GAJAA split-system air conditioner. The pressure switch is a safety device that monitors the suction-side refrigerant pressure and proves that the inducer motor is operating correctly before allowing the system to proceed through its startup sequence. When this switch fails or sticks open, the system will lock out before ignition, leaving you with no heating or cooling and often triggering a fault code on the control board.

• Specs: Low pressure switch | OEM Part No. HK02ZB028 | Factory-calibrated W.C. (water column) rating | Normally open single-pole design | Direct factory replacement for Payne PA13NR06000GAJAA
• OEM vs Generic: This is a genuine OEM pressure switch manufactured to exact factory W.C. specifications. Aftermarket substitutes frequently carry wider switching tolerances, which can cause nuisance lockouts or — more dangerously — allow operation under unsafe pressure conditions.
• Install difficulty: 3/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter (continuity mode). Inspect the rubber hose port for cracks or blockages before installing the new switch, as a clogged hose is a common root cause of switch failure.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Payne PA13NR06000GAJAA split-system unit. Always verify the OEM part number on your existing switch or equipment data plate before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required. In stock and ready to ship today.