{"product_id":"carrier-fa4cnf036008aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FA4CNF036008AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FA4CNF036008AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FA4CNF036008AAAA\u003c\/strong\u003e air handler. The transformer is the heartbeat of your system's control circuit — it steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and zone controls. When it fails, nothing responds: the thermostat goes blank, the system refuses to call for heating or cooling, and no error codes appear because the control circuit itself has lost power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Single-phase | Matches factory wiring harness and mounting footprint for the FA4CNF036008AAAA air handler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under full control-circuit load. Undersized or off-brand units can sag voltage under load, causing erratic board behavior and nuisance lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Photograph existing wiring before disconnecting. Primary and secondary leads are color-coded for straightforward reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cut-off ship 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\u003eFA4CNF036008AAAA\u003c\/strong\u003e fan coil\/air handler. Verify your existing transformer's VA rating and input\/output voltages on the unit's data plate before ordering to confirm fitment. Have questions about fit? Our HVAC parts specialists verify compatibility before you buy — just reach out.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909547839859,"sku":"CARRIE-FA4CNF036008AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909547872627,"sku":"CARRIE-FA4CNF036008AAAA-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_0900f9c5-5d9c-4625-9e3d-30442907e211.jpg?v=1782940876","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4cnf036008aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}