{"product_id":"carrier-fiop200511ga-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for FIOP200511GA — HT01BD209","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FIOP200511GA — Part# HT01BD209\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FIOP200511GA\u003c\/strong\u003e unit. The transformer steps down 120V line voltage to the 24V signal that powers your thermostat, control board, contactor coil, and every low-voltage circuit in the system. When it fails, the entire control circuit goes dark — the thermostat loses power, no calls for heat or cooling are processed, and the system will not operate at all. A failed transformer is often mistaken for a thermostat or control board fault, making this a critical first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM design | Engineered to exact Carrier tolerances for the FIOP200511GA platform\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 transformer is wound and insulated to Carrier's exact VA capacity and thermal ratings. Generic transformers frequently under-deliver on VA, causing voltage sag under load that triggers nuisance lockouts and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label all wires before disconnecting the old unit.\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 NationalHVACParts.com warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the \u003cstrong\u003eCarrier FIOP200511GA\u003c\/strong\u003e. Always verify primary voltage (120V) and VA rating on your existing transformer's label before ordering. If your system uses a 40VA transformer and matches the FIOP200511GA model designation, this is your part. Our fitment team is available to confirm compatibility before you purchase — just reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909507764595,"sku":"CARRIE-FIOP200511GA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909507797363,"sku":"CARRIE-FIOP200511GA-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_db4c2736-738b-44c5-8f4d-ff967805a23e.jpg?v=1782941049","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop200511ga-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}