{"product_id":"carrier-fa4bnf042000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FA4BNF042000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FA4BNF042000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down control transformer (part# \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FA4BNF042000AAAA\u003c\/strong\u003e air handler unit. The transformer converts 120V line voltage down 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: the thermostat goes blank, the system won't respond to calls for cooling or heating, and nothing powers on despite line voltage being present at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory OEM part number HT01CN241 | Designed for continuous low-voltage control circuit duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact Carrier factory specifications, ensuring correct VA capacity and voltage output. Undersized or off-spec generic transformers can overheat, trip their internal thermal fuse, or damage sensitive control boards — costing far more in downstream repairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring connections before removing the old transformer. Verify 24V output with a multimeter after installation before restoring full 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 Engineered specifically for the Carrier \u003cstrong\u003eFA4BNF042000AAAA\u003c\/strong\u003e air handler. Cross-reference OEM part number HT01CN241 against your unit's data plate and wiring diagram to confirm fitment before ordering. If you're unsure, our HVAC parts specialists are available to verify compatibility — just reach out before you buy. Order today and get same-day shipping on in-stock OEM Carrier parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909553967475,"sku":"CARRIE-FA4BNF042000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909554000243,"sku":"CARRIE-FA4BNF042000AAAA-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_124ac50b-d007-4d33-8848-ad3945e95142.jpg?v=1782939467","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4bnf042000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}