{"product_id":"carrier-py1rea036074abwa-pressure-switch-jri7yl","title":"OEM Carrier High Pressure Switch HK02ZA442 for PY1REA036074ABWA","description":"\u003ch1\u003eOEM Carrier High Pressure Switch HK02ZA442 for Model PY1REA036074ABWA\u003c\/h1\u003e\u003cp\u003eThis OEM high pressure switch (part number \u003cstrong\u003eHK02ZA442\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PY1REA036074ABWA\u003c\/strong\u003e packaged unit. The pressure switch monitors the inducer assembly and proves that adequate airflow and draft pressure are established before allowing the ignition sequence to proceed. When the switch fails — either stuck open or stuck closed — the control board cannot verify safe combustion conditions, resulting in a no-heat fault, repeated ignition lockout, or a fault code pointing to inducer or pressure switch failure. The companion low-pressure switch for this platform is \u003cstrong\u003eHK02ZB044\u003c\/strong\u003e; both switches work in tandem to fully prove the heat exchanger pressure envelope.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 24V control circuit | Opens at 7\" W.C. | Closes at 22\" W.C. | 50\" lead wires | OEM part number HK02ZA442 (high pressure); see also HK02ZB044 (low pressure)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM switch — factory-matched to exact W.C. setpoints and design life testing. Aftermarket switches often carry ±15% pressure tolerances, which can cause nuisance lockouts or, worse, fail to detect a blocked flue condition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Power down and confirm inducer is off before disconnecting leads. Tools needed: 1\/4\" nut driver, needle-nose pliers, and a manometer to verify setpoints post-install. Photograph existing wiring before removal. Replace both switches (HK02ZA442 + HK02ZB044) together if either has failed to avoid a repeat service call.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for Carrier model \u003cstrong\u003ePY1REA036074ABWA\u003c\/strong\u003e packaged units. Always verify the W.C. rating and lead length stamped on your existing switch before ordering. Our technical team is available to confirm fitment — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640764977523,"sku":"CARRIE-PY1REA036074ABWA-PRESSURE_SWITCH-HK02ZA442","price":95.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640765010291,"sku":"CARRIE-PY1REA036074ABWA-PRESSURE_SWITCH-HK02ZA442-GEN","price":83.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZA442_14f22884-8aae-4eae-8614-8430865dfb41.jpg?v=1775033633","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py1rea036074abwa-pressure-switch-jri7yl","provider":"National HVAC Parts","version":"1.0","type":"link"}