{"product_id":"payne-pa12na03600gabaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch HK02ZA395 \/ HK02ZB028 — PA12NA03600GABAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch HK02ZA395 \/ HK02ZB028 for Model PA12NA03600GABAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches are the factory-specified replacements for the \u003cstrong\u003ePayne PA12NA03600GABAA\u003c\/strong\u003e heat pump system. The pressure switches monitor refrigerant pressure on both the high and low sides of the refrigerant circuit, sending a signal to the control board to confirm safe operating conditions. When either switch fails or trips, the system will lock out before completing a heating or cooling cycle — a common symptom is the unit attempting to start and immediately shutting down, with a fault code indicating a pressure switch error.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e \u003cstrong\u003eHK02ZA395\u003c\/strong\u003e — High-Side Pressure Switch | \u003cstrong\u003eHK02ZB028\u003c\/strong\u003e — Low-Side Pressure Switch | OEM-rated contact voltage | Factory-calibrated trip and reset pressure thresholds matched to R-410A operating range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches from Payne (manufactured by Carrier\/ICP) are factory-calibrated to exact trip points. Generic switches often carry wider tolerance margins, risking nuisance trips or, worse, failure to protect the compressor from damaging high- or low-pressure conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Refrigerant circuit work requires an EPA 608 certified technician. Electrical swap of the switch body itself is straightforward with a flathead screwdriver and needle-nose pliers. Always disconnect power and verify refrigerant pressures are equalized before disconnecting fittings. Photograph all wiring before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both switches. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003ePayne PA12NA03600GABAA\u003c\/strong\u003e heat pump system (3-ton, single-stage, R-410A). Verify your unit's data plate and existing switch part numbers against HK02ZA395 and HK02ZB028 before ordering. These switches are also cross-referenced across Carrier and Bryant platforms sharing the same refrigerant circuit architecture. Not sure if these are the right parts? Our HVAC parts specialists verify fitment before you order — contact us and we'll confirm compatibility fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909188702579,"sku":"PAYNE-PA12NA03600GABAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909188735347,"sku":"PAYNE-PA12NA03600GABAA-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_7582dfab-a23d-4762-a952-fadf387de501.jpg?v=1780718545","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa12na03600gabaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}