{"product_id":"payne-pa10ja036000acaa-pressure-switch-jria74","title":"OEM Payne Pressure Switch High\/Low for PA10JA036000ACAA","description":"\u003ch1\u003eOEM Payne High \u0026amp; Low Pressure Switch for Model PA10JA036000ACAA\u003c\/h1\u003e\u003cp\u003eThese OEM pressure switches — \u003cstrong\u003eHK02ZA395 (High Pressure Switch)\u003c\/strong\u003e and \u003cstrong\u003eHK02ZB028 (Low Pressure Switch)\u003c\/strong\u003e — are the factory-specified replacements for the \u003cstrong\u003ePayne PA10JA036000ACAA\u003c\/strong\u003e packaged air conditioning unit. Pressure switches monitor refrigerant pressure levels on both the high and low sides of the system to protect the compressor from damage caused by abnormal operating conditions. When either switch fails or trips, the control board receives an open-circuit signal and locks out the system — typically before cooling begins — to prevent costly compressor damage. Common symptoms include the system failing to start, nuisance tripping on hot days, or a fault code indicating a pressure switch fault on your thermostat or control board display.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e HK02ZA395 — High-side pressure switch, factory-calibrated trip point | HK02ZB028 — Low-side pressure switch, factory-calibrated trip point | Both rated for R-410A refrigerant systems | Spade terminal connections for direct plug-in replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact factory trip-point pressures for the PA10JA036000ACAA. Aftermarket units often use wider tolerance thresholds, risking either nuisance shutdowns or — more dangerously — allowing the compressor to run under damaging low-refrigerant or high-head-pressure conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Electrical disconnect required before service. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm open\/closed switch state). Always recover refrigerant per EPA 608 regulations before disconnecting refrigerant-side fittings. Note and photograph all wiring before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty on both HK02ZA395 and HK02ZB028. Orders ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Both switches are designed specifically for the \u003cstrong\u003ePayne PA10JA036000ACAA\u003c\/strong\u003e 3-ton packaged air conditioning unit. Verify your existing switch part numbers — HK02ZA395 for the high-pressure side and HK02ZB028 for the low-pressure side — against the data plate and wiring diagram inside the unit before ordering. Not sure which switch you need? Our HVAC parts specialists can confirm fitment before you buy.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62909243326835,"sku":"PAYNE-PA10JA036000ACAA-PRESSURE_SWITCH-HK02ZA395","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909243359603,"sku":"PAYNE-PA10JA036000ACAA-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_4a5e6f02-dd91-45bd-890c-c2e03292b6a7.jpg?v=1780718433","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa10ja036000acaa-pressure-switch-jria74","provider":"National HVAC Parts","version":"1.0","type":"link"}