{"product_id":"carrier-fb4anf030015afaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V-24V for FB4ANF030015AFAA","description":"\u003ch1\u003eOEM Carrier 40VA Transformer HT01CN236 for Model FB4ANF030015AFAA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01CN236\u003c\/strong\u003e) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier FB4ANF030015AFAA\u003c\/strong\u003e fan coil air handler. The transformer steps down line voltage from 120V to the 24V signal required to power the thermostat, control board, and all low-voltage relay logic. When it fails, the entire control circuit goes dead — the thermostat goes blank, contactors won't energize, and the system will not respond to any call for heating or cooling. A failed transformer is often misdiagnosed as a bad control board, making this an essential first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01CN236 | Direct plug-in replacement — no field wiring modifications required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact factory VA and voltage tolerances. Undersized or off-tolerance generic transformers can blow the low-voltage fuse repeatedly, cause erratic thermostat behavior, or fail prematurely under full control-circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and verify voltage is absent with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Note wire colors and terminal positions before disconnecting the old 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\u003eFB4ANF030015AFAA\u003c\/strong\u003e fan coil air handler. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to verify compatibility before you buy — same-day shipping on all in-stock orders.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909544202611,"sku":"CARRIE-FB4ANF030015AFAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909544235379,"sku":"CARRIE-FB4ANF030015AFAA-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_eff44220-53ed-4aba-bdc4-17c9db57c0a1.jpg?v=1782939487","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fb4anf030015afaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}