{"product_id":"carrier-fv4cnf005000aaaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FV4CNF005000AAAA","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model FV4CNF005000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FV4CNF005000AAAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V to 24V AC to power the control board, thermostat, and all low-voltage system controls. When this transformer fails, the entire control circuit goes dark — your thermostat shows no response, the system won't call for heating or cooling, and the unit sits completely unresponsive regardless of settings.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN236 | Factory-matched for Carrier FV4CNF005000AAAA air handlers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can sag under full control load, causing intermittent lockouts, nuisance tripping, and premature control board failure — a far costlier repair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and verify with a non-contact voltage tester before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring connections before disconnecting. The transformer mounts to the air handler cabinet and reconnects to the control board harness.\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\u003eFV4CNF005000AAAA\u003c\/strong\u003e fan coil air handler. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Not sure this is the right part? Our HVAC parts specialists verify fitment before you buy — no guesswork, no returns.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909491413363,"sku":"CARRIE-FV4CNF005000AAAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909491446131,"sku":"CARRIE-FV4CNF005000AAAA-TRANSFORMER-HT01CN236-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-HT01CN236_e9095028-e520-47f9-a280-9545592aae57.jpg?v=1782941143","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fv4cnf005000aaaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}