{"product_id":"carrier-fb4cnf036l15aeaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 120V-24V for FB4CNF036L15AEAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model FB4CNF036L15AEAA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eFB4CNF036L15AEAA\u003c\/strong\u003e fan coil air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers every component in your control circuit — thermostat, contactor coil, gas valve, and control board. When the transformer fails, nothing responds: the thermostat goes blank, the system won't call for heating or cooling, and you may measure 0V at the R and C terminals on your control board. A failed transformer is often the first casualty of a shorted zone valve, bad thermostat wiring, or a grounded low-voltage wire.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched impedance | Meets UL and original OEM electrical tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01CN241 transformer is wound to exact factory VA and impedance specifications. Generic transformers with loose tolerances can under-deliver current under load, causing intermittent lockouts, erratic thermostat behavior, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off the air handler disconnect and verify zero voltage at the transformer primary before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Photograph all wiring connections before disconnecting. Replacement typically takes 20–30 minutes.\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 specifically for the Carrier \u003cstrong\u003eFB4CNF036L15AEAA\u003c\/strong\u003e fan coil air handler. Always verify transformer VA rating and primary\/secondary voltages on your unit's data plate before ordering. If you've had a low-voltage short, inspect all 24V wiring for damage before installing the new transformer to prevent repeat failures. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — same-day shipping on in-stock parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909536436595,"sku":"CARRIE-FB4CNF036L15AEAA-TRANSFORMER-HT01CN241","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909536469363,"sku":"CARRIE-FB4CNF036L15AEAA-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_d72b57ee-9210-4881-8f51-b5721fb1aa25.jpg?v=1782939535","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4cnf036l15aeaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}