{"product_id":"carrier-fa4cnc042010aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FA4CNC042010AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model FA4CNC042010AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# HT01CN241) for the \u003cstrong\u003eCarrier FA4CNC042010AAAA\u003c\/strong\u003e fan coil air handler. 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 this transformer fails, the entire control circuit goes dead: your thermostat goes blank, the system won't respond to any calls for heating or cooling, and in some cases you may notice a burning smell or a tripped low-voltage fuse. It is one of the most overlooked yet critical components in the system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM Part Number: HT01CN241 | Factory-matched output for stable control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-spec generic units can cause nuisance tripping, control board damage, or erratic thermostat behavior — making OEM the only recommended choice for this application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to verify 24V output after installation. Always confirm correct wiring polarity and check for shorted low-voltage wiring before replacing the transformer.\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 for the Carrier \u003cstrong\u003eFA4CNC042010AAAA\u003c\/strong\u003e fan coil air handler. Verify part number HT01CN241 against your unit's data plate or existing transformer label before ordering. If you are unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy. Order now for same-day shipping.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909549085043,"sku":"CARRIE-FA4CNC042010AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909549117811,"sku":"CARRIE-FA4CNC042010AAAA-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_89c3b486-848f-450c-99ee-9851d61a6484.jpg?v=1782939482","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4cnc042010aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}