{"product_id":"carrier-fiop300f501ga-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for FIOP300F501GA — HT01BD209","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FIOP300F501GA — Part HT01BD209\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eFIOP300F501GA\u003c\/strong\u003e unit. The transformer steps down line voltage from 120V AC to the 24V AC signal used by your thermostat, control board, contactor coil, and all low-voltage control circuit components. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and in many cases the unit appears completely non-functional even though line power is present. A failed transformer is one of the most commonly misdiagnosed faults in the field, so always verify 24V output at the secondary terminals before condemning other components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD209 | Factory-matched electrical specification for FIOP300F501GA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer meets Carrier's exact VA rating and insulation class. Undersized or off-spec generic transformers frequently burn out prematurely under load, especially when multiple low-voltage accessories (humidifiers, zoning boards, UV lights) share the same circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wiring before disconnecting. Verify 24V output with multimeter after installation before restoring full system power.\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 Designed for the Carrier \u003cstrong\u003eFIOP300F501GA\u003c\/strong\u003e unit with OEM part number HT01BD209. Always confirm your existing transformer's input\/output voltage and VA rating against your unit's wiring diagram before ordering. Our parts specialists are available to verify fitment — reach out before you order if you have any questions. Order today and receive same-business-day shipping on all in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909502095731,"sku":"CARRIE-FIOP300F501GA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909502128499,"sku":"CARRIE-FIOP300F501GA-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_493e3d73-aaab-41be-8730-3a7337f9e9c1.jpg?v=1782941076","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop300f501ga-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}