{"product_id":"carrier-ph4gnxb36000aa-transformer-h3025m","title":"OEM Carrier Transformer 120V-24V 40VA for PH4GNXB36000AA","description":"\u003ch1\u003eOEM Carrier Transformer 120V–24V 40VA for Model PH4GNXB36000AA\u003c\/h1\u003e\u003cp\u003eThis OEM step-down transformer (part number \u003cstrong\u003eHT01BD242\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH4GNXB36000AA\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this part fails, the system goes completely unresponsive: the thermostat goes dark, the contactor won't pull in, and no heating or cooling cycle can initiate.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | OEM Part Number: HT01BD242 | Factory-matched winding tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory specifications for the Carrier PH4GNXB36000AA, ensuring precise 24V output under full load. Generic transformers often run outside ±5% voltage tolerance, which can cause nuisance lockouts or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Photograph all wiring connections before removal. Wire nuts or terminal connectors may be required depending on installation.\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\u003ePH4GNXB36000AA\u003c\/strong\u003e packaged unit. Always verify primary input voltage and VA rating on your unit's data plate before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you order — reach out before checkout.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641229332851,"sku":"CARRIE-PH4GNXB36000AA-TRANSFORMER-HT01BD242","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641229365619,"sku":"CARRIE-PH4GNXB36000AA-TRANSFORMER-HT01BD242-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD242_2f043a31-8e6c-4573-8662-e8c992f47a64.jpg?v=1775040982","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnxb36000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}