OEM Payne High & Low Pressure Switch for Model PA10PA03600MABAA

These OEM pressure switches — HK02ZA395 (High Pressure Switch) and HK02ZB028 (Low Pressure Switch) — are the factory-specified replacements for the Payne PA10PA03600MABAA packaged air conditioning unit. Pressure switches prove that the system's refrigerant pressures are within safe operating limits before allowing the control board to proceed through the startup sequence. When either switch fails, the unit will typically lock out before ignition, trip a fault code, or cycle off immediately after startup — symptoms often misdiagnosed as a refrigerant or compressor issue.

• Specs: HK02ZA395 — High-side pressure switch, factory-calibrated cut-out set point | HK02ZB028 — Low-side pressure switch, factory-calibrated cut-in set point | OEM-matched pressure ratings for R-410A refrigerant systems | Direct plug-in spade terminal connectors for drop-in replacement
• OEM vs Generic: OEM Payne/Carrier pressure switches are factory-calibrated to exact W.C. or PSI set points for this model. Generic alternatives frequently carry wider tolerances that can allow unsafe operating pressures, risking compressor damage or nuisance lockouts.
• Install difficulty: 2/5 — Shut off power at the disconnect and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for continuity verification. Always photograph existing wiring and hose routing before disconnecting. Note which switch (high or low side) is being replaced to ensure correct reinstallation.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before cutoff.

Compatibility: These pressure switches are engineered specifically for the Payne PA10PA03600MABAA packaged air conditioning unit. Verify OEM part numbers HK02ZA395 and HK02ZB028 against your unit's wiring diagram or data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.