{"product_id":"carrier-ph12na04800gacaa-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch HK02ZB038 for PH12NA04800GACAA","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model PH12NA04800GACAA\u003c\/h1\u003e\u003cp\u003eThis OEM pressure switch (part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH12NA04800GACAA\u003c\/strong\u003e heat pump. The pressure switch is a critical safety component in the heating sequence — it monitors negative pressure created by the draft inducer motor to confirm proper venting before allowing ignition. If the switch fails to close (or is stuck open\/closed), the control board interprets this as a venting fault and locks out the system, resulting in a no-heat condition. Common symptoms include the inducer running but ignition never starting, a blinking fault code indicating a pressure switch error, or the system cycling off shortly after a call for heat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM Part No. HK02ZB038 | Factory water-column (W.C.) rating matched to Carrier PH12NA04800GACAA | Single-port pressure switch | 24V control circuit compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM switch calibrated to the exact W.C. set point required by your unit. Aftermarket switches frequently carry wider W.C. tolerances, which can cause nuisance lockouts or — more dangerously — allow operation under inadequate draft conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Turn off power at the disconnect and gas supply before servicing. Tools needed: 1\/4\" nut driver, flathead screwdriver, needle-nose pliers, and a manometer if verifying W.C. pull. Disconnect the rubber hose and two wiring harness terminals, then swap and reconnect. Always inspect the hose and port for blockage or moisture before installing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Directly fits \u003cstrong\u003eCarrier model PH12NA04800GACAA\u003c\/strong\u003e (4-ton heat pump). Always verify the W.C. rating stamped on your existing switch matches this part before installation. If you are unsure, our HVAC parts specialists can confirm fitment — contact us before ordering. Order today and receive same-day shipping on all in-stock OEM Carrier parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641945182579,"sku":"CARRIE-PH12NA04800GACAA-PRESSURE_SWITCH-HK02ZB038","price":43.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641945215347,"sku":"CARRIE-PH12NA04800GACAA-PRESSURE_SWITCH-HK02ZB038-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-HK02ZB038_27f67575-eaeb-4df6-924e-032076d2204a.jpg?v=1775038359","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na04800gacaa-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}