{"product_id":"carrier-pf4mnb043l00abaa-transformer-h3hwwy","title":"OEM Carrier Transformer 40VA 208\/230V–24V for PF4MNB043L00ABAA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 208\/230V–24V for Model PF4MNB043L00ABAA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier replacement transformer (part #HT01CN241) for the \u003cstrong\u003ePF4MNB043L00ABAA\u003c\/strong\u003e fan coil and air handler unit. The transformer steps down the 208\/230V line voltage to the 24V AC signal that powers your system's entire control circuit — including the thermostat, zone valves, contactor coil, and control board. When this part fails, the result is typically a completely unresponsive system: the thermostat goes blank, the unit won't call for heating or cooling, and no fault codes appear because the control circuit itself has no power. A blown fuse on the secondary side is the first symptom; a shorted transformer is the cause.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/230V Primary | 24V Secondary | 40VA Rating | Direct OEM factory-matched replacement for part #HT01CN241\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier Factory Authorized Part, manufactured to exact voltage and VA tolerances. Generic transformers often run outside rated VA capacity, risking nuisance fuse blows and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output post-install). Photograph all wiring connections before disconnecting the old transformer. Replace the 3A secondary fuse if blown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer's warranty. In-stock orders ship same business day from our warehouse when placed before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct OEM replacement for \u003cstrong\u003eCarrier model PF4MNB043L00ABAA\u003c\/strong\u003e fan coil units. Verify your unit's data plate shows 208\/230V primary input and 24V control circuit before ordering. Not sure if this is the right part? Contact our fitment team — we verify compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62643261407603,"sku":"CARRIE-PF4MNB043L00ABAA-TRANSFORMER-HT01CN241","price":108.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62643261440371,"sku":"CARRIE-PF4MNB043L00ABAA-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_66c1fa0f-a6fd-48b9-bdc2-ae79cb091c97.jpg?v=1775041619","url":"https:\/\/nationalhvacparts.com\/products\/carrier-pf4mnb043l00abaa-transformer-h3hwwy","provider":"National HVAC Parts","version":"1.0","type":"link"}