{"product_id":"payne-pa1rja048000aawb-pressure-switch-jri7yl","title":"OEM Payne Pressure Switch HK02ZA442 \/ HK02ZB044 — PA1RJA048000AAWB","description":"\u003ch1\u003eOEM Payne Pressure Switch HK02ZA442 \/ HK02ZB044 for Model PA1RJA048000AAWB\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM pressure switch assembly for the \u003cstrong\u003ePayne PA1RJA048000AAWB\u003c\/strong\u003e packaged unit. The pressure switch is a critical safety component in the ignition sequence — it monitors negative pressure created by the draft inducer motor to confirm proper venting before allowing the gas valve to open. When this switch fails or sticks open, the furnace control board will lockout the heating cycle before ignition even begins, leaving you with a blinking fault code and no heat. Two OEM part numbers apply to this model: \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e (High Pressure Switch) and \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e (Pressure Switch) — verify your existing switch's part number stamped on the body or listed on your unit's wiring diagram before ordering.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Rated for the factory-specified water column (W.C.) set point | Single-port diaphragm design | 1\/4\" Spade terminals | Direct OEM replacement for Payne PA1RJA048000AAWB packaged units\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to exact W.C. tolerances from the factory. Aftermarket switches frequently drift out of spec, causing nuisance lockouts or — more dangerously — failing to detect a blocked flue, making OEM the only safe choice for this safety-critical component.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Turn off power and gas before beginning. Tools needed: 1\/4\" nut driver, flathead screwdriver, needle-nose pliers, and a manometer to verify set point after installation. Inspect the rubber hose connecting the switch to the inducer for cracks or blockages before replacing the switch, as a collapsed hose is a common root cause of pressure switch faults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 Engineered specifically for the \u003cstrong\u003ePayne PA1RJA048000AAWB\u003c\/strong\u003e packaged unit. Cross-references OEM part numbers HK02ZA442 and HK02ZB044. Confirm the part number printed on your existing switch before ordering to ensure correct W.C. rating. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back online fast.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908957360499,"sku":"PAYNE-PA1RJA048000AAWB-PRESSURE_SWITCH-HK02ZA442","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908957393267,"sku":"PAYNE-PA1RJA048000AAWB-PRESSURE_SWITCH-HK02ZA442-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-HK02ZA442_e3c7cdea-3780-4bf7-bf66-49bc3715cb02.jpg?v=1780718573","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa1rja048000aawb-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}