{"product_id":"carrier-fiop200b521ga-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V-24V for FIOP200B521GA — HT01BD209","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FIOP200B521GA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FIOP200B521GA\u003c\/strong\u003e. It steps down line voltage (120V) to the 24V signal voltage required by your thermostat, control board, contactor coil, and all low-voltage system controls. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no relays or contactors will energize. It is often the first component to check when nothing works at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120VAC | Secondary voltage: 24VAC | VA rating: 40VA | Factory OEM part number: HT01BD209 | Matched to Carrier factory tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine OEM Carrier transformer, not an aftermarket substitute. OEM units are wound to exact VA ratings, preventing under-voltage conditions that cause nuisance lockouts and premature control board failures common with undersized generic transformers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring before disconnecting. Confirm secondary output reads 24VAC with a meter before closing up the 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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eFIOP200B521GA\u003c\/strong\u003e. Always verify your unit's control circuit voltage requirements and VA load on the data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you purchase. Order now and enjoy same-day shipping on all in-stock OEM Carrier parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909506847091,"sku":"CARRIE-FIOP200B521GA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909507010931,"sku":"CARRIE-FIOP200B521GA-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_434e0b1c-79cc-4c64-9360-e305fd0741c9.jpg?v=1782939612","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop200b521ga-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}