{"product_id":"carrier-fh4cnb004000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FH4CNB004000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FH4CNB004000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier FH4CNB004000AAAA\u003c\/strong\u003e fan coil air handler. The transformer is the backbone of your system's low-voltage control circuit — it steps 120V line voltage down to 24V AC to power the thermostat, control board, and all relay coils. When the transformer fails, absolutely nothing works: the thermostat goes dark, the system won't respond to any call for heating or cooling, and you may detect a burnt or overheated smell near the air handler cabinet.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM windings | Designed for continuous-duty HVAC control circuit use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer meets Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can overheat under load from multiple zone valves or relays, causing repeated nuisance failures and potential control board damage.\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 (to verify 24V output after install), wire nuts or spade connectors. Label all low-voltage wires before disconnecting from secondary terminals.\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\u003eFH4CNB004000AAAA\u003c\/strong\u003e fan coil air handler. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you buy. Order today and receive same-day shipping on in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909511926131,"sku":"CARRIE-FH4CNB004000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909511958899,"sku":"CARRIE-FH4CNB004000AAAA-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_641b686d-8925-40c2-ad5a-594e81610701.jpg?v=1782939602","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fh4cnb004000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}