{"product_id":"carrier-fa4anf030008agaa-transformer-h3hww2","title":"OEM Carrier Transformer 40VA 120V\/24V for FA4ANF030008AGAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model FA4ANF030008AGAA\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 FA4ANF030008AGAA\u003c\/strong\u003e air handler. It steps down line voltage (120V) to the 24V signal voltage required by the thermostat, control board, contactor coil, and all low-voltage controls throughout the system. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, nothing responds, and the system will not start in any mode. It is one of the first components to check when a system shows zero response despite confirmed line-voltage power at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01CN236 | Factory-matched to Carrier FA4ANF030008AGAA air handler control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Generic transformers may run under-rated VA loads, causing overheating, nuisance tripping, or premature control board failure — particularly under high-demand multi-zone thermostat wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before removal. Verify 24V output with a multimeter after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled parts warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-matched for the Carrier \u003cstrong\u003eFA4ANF030008AGAA\u003c\/strong\u003e air handler. Always confirm your unit's data plate voltage requirements match 120V primary \/ 24V secondary 40VA before ordering. Our parts specialists are available to verify fitment — order with confidence and get back to comfort fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909557965171,"sku":"CARRIE-FA4ANF030008AGAA-TRANSFORMER-HT01CN236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909557997939,"sku":"CARRIE-FA4ANF030008AGAA-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_9bf7f49c-d27a-46fb-96ea-b63f1f16b95d.jpg?v=1782940851","url":"https:\/\/nationalhvacparts.com\/products\/carrier-fa4anf030008agaa-transformer-h3hww2","provider":"National HVAC Parts","version":"1.0","type":"link"}