{"product_id":"carrier-tfaccy50dj902771-pressure-switch-jrhhvr","title":"OEM Carrier Pressure Switch 22#CLS 7#OPN 50\" Leads — TFACCY50DJ902771","description":"\u003ch1\u003eOEM Carrier Pressure Switch HK02ZB038 for Model TFACCY50DJ902771\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement pressure switch for the \u003cstrong\u003eCarrier TFACCY50DJ902771\u003c\/strong\u003e packaged unit. The pressure switch is a critical safety component in the combustion air system — it monitors negative pressure produced by the inducer draft motor to confirm adequate airflow before allowing ignition to proceed. When this switch fails, the control board cannot verify that the inducer is running at proper speed, causing the furnace or packaged unit to lock out before any ignition attempt. Common symptoms include a blinking fault code for \"pressure switch stuck open,\" no-heat calls that never progress to ignition, or repeated short-cycle lockouts during cold-weather operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Closes at 22\" W.C. | Opens at 7\" W.C. | 50\" lead wire length | Factory-calibrated single-port diaphragm design\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM switch (part HK02ZB038), factory-calibrated to exact W.C. thresholds. Aftermarket switches often carry ±15% pressure tolerances, leading to nuisance lockouts in cold weather or dangerous bypassing of low-draft conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power before servicing. Tools needed: 1\/4\" nut driver, needle-nose pliers, and a vacuum pump or manometer for post-install verification. Snap the hose barb onto the inducer port, connect the two spade terminals, and restore power. Always clear fault codes after replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty against defects. Ships same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Directly replaces OEM part number \u003cstrong\u003eHK02ZB038\u003c\/strong\u003e on Carrier model \u003cstrong\u003eTFACCY50DJ902771\u003c\/strong\u003e. Verify the W.C. rating and lead length on your unit's existing switch and data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before every order — order with confidence and get back to heat fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640259989875,"sku":"CARRIE-TFACCY50DJ902771-PRESSURE_SWITCH-HK02ZB038","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640260022643,"sku":"CARRIE-TFACCY50DJ902771-PRESSURE_SWITCH-HK02ZB038-GEN","price":50.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-HK02ZB038_a0d42533-c6a1-47c2-93eb-b3a1c1744908.jpg?v=1775037037","url":"https:\/\/nationalhvacparts.com\/products\/carrier-tfaccy50dj902771-pressure-switch-jrhhvr","provider":"National HVAC Parts","version":"1.0","type":"link"}