{"product_id":"carrier-fiop300511ga-transformer-h30291","title":"OEM Carrier Transformer 40VA 120V\/24V for FIOP300511GA — HT01BD209","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FIOP300511GA — Part HT01BD209\u003c\/h1\u003e\u003cp\u003eThis OEM control circuit transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier FIOP300511GA\u003c\/strong\u003e unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When this part fails, the entire control circuit goes dark — the thermostat loses power, relays won't energize, and the system will not heat, cool, or respond to any commands. If nothing happens when you adjust the thermostat, a failed transformer is one of the first components to test.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary | 40VA rated | Factory OEM part number HT01BD209 | Direct plug-and-play replacement for Carrier FIOP300511GA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the exact factory transformer matched to Carrier's control circuit design. Generic transformers may carry incorrect VA ratings or use lower-grade windings, risking control board damage or nuisance tripping of the secondary fuse.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching terminals). Label or photograph all low-voltage wiring prior to disconnecting. Standard spade or screw terminal connections.\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 and factory-matched for the \u003cstrong\u003eCarrier FIOP300511GA\u003c\/strong\u003e. Verify your unit's data plate voltage requirements and existing transformer VA rating before ordering to ensure a correct fit. 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":62909504487795,"sku":"CARRIE-FIOP300511GA-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909504520563,"sku":"CARRIE-FIOP300511GA-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_38ca0d27-2131-4a31-a209-c9719f9a14f6.jpg?v=1782941056","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fiop300511ga-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}