{"product_id":"carrier-pf4mnb049l00acaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 208\/230V–24V for PF4MNB049L00ACAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/230V–24V for Model PF4MNB049L00ACAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier replacement transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003ePF4MNB049L00ACAA\u003c\/strong\u003e air handler. The transformer is the backbone of your system's low-voltage control circuit — it steps down 208\/230V line voltage to the 24V signal power that runs your thermostat, control board, contactor coils, and zone valves. When it fails, the entire control circuit goes dark: your thermostat loses communication, the system won't respond to calls for heating or cooling, and no components will energize. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA power rating | Direct OEM drop-in replacement | Factory-matched winding tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact Carrier specifications, delivering a stable 24V output under full load. Generic units may sag under load voltage, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Identify and label all 24V secondary wires before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Always restore power and check output voltage before closing the unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse when ordered by 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a factory-specified replacement for the Carrier \u003cstrong\u003ePF4MNB049L00ACAA\u003c\/strong\u003e air handler. Confirm 208\/230V primary supply voltage and 24V\/40VA control circuit requirements on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before every order — reach out before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643257737587,"sku":"CARRIE-PF4MNB049L00ACAA-TRANSFORMER-HT01CN241","price":108.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643257770355,"sku":"CARRIE-PF4MNB049L00ACAA-TRANSFORMER-HT01CN241-GEN","price":95.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_08fbe9e9-ecdb-436a-bd13-776df7eed142.jpg?v=1775041622","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb049l00acaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}