{"product_id":"carrier-fh4cnf003000aaaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V\/24V for FH4CNF003000AAAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01CN241 for Model FH4CNF003000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier FH4CNF003000AAAA\u003c\/strong\u003e fan coil unit. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, control board, and low-voltage safety circuits. When it fails, the result is typically a completely unresponsive system — the thermostat goes dark, the blower won't run, and no call for heating or cooling is answered. A blown fuse on the secondary side is often the first clue that the transformer has been overloaded or has shorted internally.\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 tolerance for stable low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Carrier's exact VA and voltage tolerances, ensuring reliable 24V output under full control-circuit load. Generic transformers with loose tolerances can cause nuisance trips, erratic thermostat behavior, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after installation. Photograph or label all low-voltage wiring before removing the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship 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\u003eFH4CNF003000AAAA\u003c\/strong\u003e fan coil unit. Always verify transformer VA rating and primary\/secondary voltages on your unit's wiring diagram or data plate before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — ships same day when ordered before 3PM.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909511565683,"sku":"CARRIE-FH4CNF003000AAAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909511598451,"sku":"CARRIE-FH4CNF003000AAAA-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_db46cc3b-90bd-4f0f-84c9-1f620928364b.jpg?v=1782941015","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fh4cnf003000aaaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}