{"product_id":"carrier-fiop200e521ga-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for FIOP200E521GA — HT01BD209","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V Control Circuit for Model FIOP200E521GA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eFIOP200E521GA\u003c\/strong\u003e unit. The transformer steps down line voltage (120V) to the 24V low-voltage signal required to power the control board, thermostat, and all safety circuits. When the transformer fails, the entire control circuit loses power — the thermostat goes blank, the system becomes completely unresponsive, and no heating or cooling function can be initiated. Replacing a failed transformer with the correct OEM unit restores full system operation quickly and reliably.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Class 2 transformer | Factory-matched for FIOP200E521GA control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound and rated to exact Carrier factory specifications, ensuring stable 24V output under full control circuit load. Generic transformers may under-deliver VA capacity, causing nuisance trips, erratic thermostat behavior, or premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and disconnect switch before servicing. Tools needed: flat-head and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eFIOP200E521GA\u003c\/strong\u003e unit with OEM part number HT01BD209. Always verify your unit's transformer VA rating and primary\/secondary voltage on the data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility before you purchase — same-day shipping on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909505536371,"sku":"CARRIE-FIOP200E521GA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909505569139,"sku":"CARRIE-FIOP200E521GA-TRANSFORMER-HT01BD209-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD209_1e40e653-2132-4d40-a4fa-f29c45d15116.jpg?v=1782941054","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop200e521ga-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}