{"product_id":"carrier-pf4mnb031000abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 120V–24V 40VA for PF4MNB031000ABAA","description":"\u003ch1\u003eOEM Carrier Control Transformer 120V–24V 40VA for Model PF4MNB031000ABAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part number \u003cstrong\u003eHT01CN241\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PF4MNB031000ABAA\u003c\/strong\u003e air handler. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this component fails, the entire control circuit goes dead — your thermostat shows no power, the system won't respond to any call for heating or cooling, and you may blow 24V fuses repeatedly if a secondary short is present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary | 24V secondary | 40 VA rating | Direct OEM replacement for part number HT01CN241 | Factory-matched to Carrier wiring harness and mounting footprint\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. Generic transformers often run under-rated VA, causing overheating, nuisance tripping, or premature control board failure — especially under high accessory loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the air handler before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label and photograph all low-voltage wiring before disconnecting from the old transformer.\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 warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the Carrier \u003cstrong\u003ePF4MNB031000ABAA\u003c\/strong\u003e air handler. Always verify your unit's data plate voltage and VA requirements match before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643267699059,"sku":"CARRIE-PF4MNB031000ABAA-TRANSFORMER-HT01CN241","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643267731827,"sku":"CARRIE-PF4MNB031000ABAA-TRANSFORMER-HT01CN241-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01CN241_90cffca4-acb2-42ed-bac9-722e6fe6b824.jpg?v=1775041030","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb031000abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}