OEM Payne High Pressure Switch HK02ZA395 for Model PA1ZPA036000AAAA

This OEM high pressure switch is the factory-specified replacement part number HK02ZA395 for the Payne PA1ZPA036000AAAA split-system air conditioner. The high pressure switch monitors refrigerant pressure on the high side of the system and sends a signal to the control board to shut down the compressor if pressure exceeds safe operating limits. When it fails or trips, the system will enter a safety lockout — commonly displaying a fault code — and refuse to run, protecting your compressor from catastrophic damage. A failed or stuck-open switch can cause nuisance lockouts even when refrigerant pressures are normal, while a failed closed switch can leave your system unprotected during an actual high-pressure event.

• Specs: High-side pressure switch | Factory OEM part number HK02ZA395 | Designed for R-410A refrigerant systems | Rated to factory cut-out and cut-in pressure specifications for the PA1ZPA036000AAAA platform
• OEM vs Generic: OEM pressure switches are calibrated to exact factory cut-out pressure thresholds. Aftermarket units often carry wider tolerances that can trip prematurely or fail to protect at the correct setpoint, risking compressor damage.
• Install difficulty: 3/5 — Refrigerant system work must be performed by an EPA 608-certified technician. Tools needed: manifold gauge set, multimeter, adjustable wrench, and refrigerant recovery equipment. Always recover refrigerant before replacing the switch if it is in the refrigerant circuit.
• Warranty: 1-year OEM factory warranty. Orders placed before our same-day cutoff ship the same business day from our stocked warehouse.

Compatibility: Engineered specifically for the Payne PA1ZPA036000AAAA (3-ton) split-system air conditioner. Confirm part number HK02ZA395 against your unit's data plate or existing switch label before ordering. Not sure if this fits your unit? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.