{"product_id":"carrier-fy5bnf036l00aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FY5BNF036L00AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FY5BNF036L00AAAA\u003c\/h1\u003e\u003cp\u003eThis is the OEM factory-specified control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FY5BNF036L00AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, the entire control system goes dark: your thermostat loses power, the system won't respond to calls for heating or cooling, and you may find a blown fuse on the control board. A failed transformer is often misdiagnosed as a board failure, so always check transformer output voltage first with a multimeter before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01CN241 | Direct drop-in replacement with factory-matched terminals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA and voltage tolerance specifications. Generic transformers frequently run under-rated VA, causing nuisance tripping, overheating, and premature failure — especially in systems with high control circuit loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals before reassembling 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 specifically for the Carrier \u003cstrong\u003eFY5BNF036L00AAAA\u003c\/strong\u003e fan coil unit. Cross-reference your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to confirm fitment. Have questions about compatibility? Our HVAC parts specialists verify fitment before you order — contact us anytime.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909459202419,"sku":"CARRIE-FY5BNF036L00AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909459235187,"sku":"CARRIE-FY5BNF036L00AAAA-TRANSFORMER-HT01CN241-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-HT01CN241_d8481b0e-7482-41c2-9a15-efa0e3609bad.jpg?v=1782941279","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fy5bnf036l00aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}