{"product_id":"payne-pa10ja036000aaaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA10JA036000AAAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA10JA036000AAAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA10JA036000AAAA\u003c\/strong\u003e packaged air conditioning unit. The high pressure switch (HK02ZA395) and low pressure switch (HK02ZB028) monitor refrigerant pressure on both the high and low sides of the refrigerant circuit, sending a signal to the control board to shut down compressor operation if pressures fall outside safe operating limits. When either switch fails or trips without resetting, the system will typically lock out before completing a cooling cycle — presenting as a no-cooling fault, a compressor that won't energize, or a control board fault code indicating a pressure switch open circuit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High Side Pressure Switch | HK02ZB028 — Low Side Pressure Switch | OEM-rated setpoints matched to R-22 or R-410A refrigerant circuit of the PA10JA036000AAAA | Spade terminal connections | Factory-specified trip and reset thresholds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Payne\/Carrier-sourced pressure switches are calibrated to exact factory trip and reset pressures. Aftermarket substitutes frequently use wider tolerance setpoints, risking nuisance trips or — more critically — failure to protect the compressor from true overpressure or loss-of-charge conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires EPA 608 certification if lines must be accessed. Pressure switch replacement itself is typically low-voltage wiring only (tools: needle-nose pliers, 1\/4\" nut driver, multimeter). Always de-energize the unit at the disconnect and verify 0V before handling. Photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA10JA036000AAAA\u003c\/strong\u003e 3-ton packaged air conditioning unit. Verify the failed switch against OEM part numbers HK02ZA395 (high pressure) and HK02ZB028 (low pressure) stamped on the existing switch body before ordering. Not sure which switch you need? Our HVAC parts specialists confirm fitment before your order ships — contact us today and get back up and running fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909244408179,"sku":"PAYNE-PA10JA036000AAAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909244440947,"sku":"PAYNE-PA10JA036000AAAA-PRESSURE_SWITCH-HK02ZA395-GEN","price":38.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA395_b23b7e88-c9c6-413d-be1e-cd3c808692d5.jpg?v=1780718529","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja036000aaaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}