{"product_id":"carrier-ph4gnaa48000aa-transformer-h3025m","title":"OEM Carrier Transformer 40VA 24V for PH4GNAA48000AA — HT01BD242","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V–24V for Model PH4GNAA48000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD242\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier PH4GNAA48000AA\u003c\/strong\u003e packaged heating and cooling unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the system goes completely silent: no thermostat response, no fan, no heat or cool. It is one of the most fundamental components in any HVAC system and is the first item to check when a unit shows zero electrical response.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | 40VA rated | Factory OEM tolerance matched for the Carrier \u003cstrong\u003ePH4GNAA48000AA\u003c\/strong\u003e control circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers (HT01BD242) are wound and potted to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic units can sag under load, causing nuisance lockouts, relay chatter, or 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 beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or spade connectors, multimeter. Label all wires before disconnecting. Verify 24V output with a multimeter after installation before closing the cabinet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-specified for the Carrier \u003cstrong\u003ePH4GNAA48000AA\u003c\/strong\u003e packaged unit. Always verify your unit's control circuit voltage and VA rating on the data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641230971251,"sku":"CARRIE-PH4GNAA48000AA-TRANSFORMER-HT01BD242","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641231004019,"sku":"CARRIE-PH4GNAA48000AA-TRANSFORMER-HT01BD242-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-HT01BD242_87892fd9-1dbc-42d6-a4b4-826f57c42d38.jpg?v=1782942671","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnaa48000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}