{"product_id":"payne-pa1rea048000aawa-pressure-switch-jri7yl","title":"OEM Payne Pressure Switch HK02ZA442 \/ HK02ZB044 — PA1REA048000AAWA","description":"\u003ch1\u003eOEM Payne High Pressure Switch HK02ZA442 \/ HK02ZB044 for Model PA1REA048000AAWA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch is the factory-specified replacement for the \u003cstrong\u003ePayne PA1REA048000AAWA\u003c\/strong\u003e packaged unit. The pressure switch monitors the inducer blower to confirm adequate airflow before allowing the ignition sequence to proceed. It detects negative pressure (measured in inches of water column, W.C.) created by the draft inducer motor. When this switch fails or remains open, the control board interprets the condition as a blocked flue or failed inducer and locks out the system — resulting in a no-heat call with no ignition attempt. This listing covers both OEM part numbers \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e (High Pressure Switch) and \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e (Pressure Switch) as applicable to this model.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Replaces OEM part numbers HK02ZA442 \u0026amp; HK02ZB044 | Factory-matched W.C. rating | Single-port or dual-port hose connection | 24V control circuit compatible | Meets original factory specifications for Payne PA1REA048000AAWA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM pressure switches are calibrated to the exact W.C. setpoint required by your unit. Generic alternatives often carry wider tolerance ratings, which can cause nuisance lockouts in cold weather or — more dangerously — allow ignition under marginally unsafe draft conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Confirm inducer motor operation and inspect hose tubing for cracks or clogs before replacing the switch. Tools needed: flathead screwdriver, needle-nose pliers, multimeter (continuity test). Always disconnect power at the disconnect box before beginning. Photograph hose routing and wiring before removal.\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 Designed specifically for the Payne \u003cstrong\u003ePA1REA048000AAWA\u003c\/strong\u003e packaged unit (4-ton, R-410A). Verify your existing part number — HK02ZA442 or HK02ZB044 — against your unit's wiring diagram or data plate before ordering to ensure correct switch selection. Not sure which one you need? Our parts team will verify fitment before you order — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908962799987,"sku":"PAYNE-PA1REA048000AAWA-PRESSURE_SWITCH-HK02ZA442","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908962832755,"sku":"PAYNE-PA1REA048000AAWA-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_1618150b-82bb-4b47-b69e-1b404631f2a1.jpg?v=1780718570","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa1rea048000aawa-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}