{"product_id":"carrier-ph4gnaa42000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GNAA42000AA","description":"\u003ch1\u003eOEM Carrier 75VA Control Transformer HT01BD242 for Model PH4GNAA42000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer for the \u003cstrong\u003eCarrier PH4GNAA42000AA\u003c\/strong\u003e packaged heat pump unit. The transformer is the backbone of your HVAC control circuit, stepping high-line voltage (208\/240\/480V) down to a safe 24VAC to power the thermostat, control board, contactors, and all low-voltage accessories. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to calls for heating or cooling, and nothing operates. Replacing it with the correct OEM unit restores full system function immediately.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e OEM Part # HT01BD242 | Input: 208\/240\/480V Primary | Output: 24VAC Secondary | Power Rating: 75VA | Frequency: 50\/60Hz | Foot-mount configuration | Factory-matched tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and rated to Carrier's exact factory specifications. Off-brand units often have looser VA ratings and inferior insulation, causing premature failure and potential control board damage downstream.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off all power and verify zero voltage before proceeding. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all low-voltage wires before disconnecting the old unit. Foot-mount design simplifies bracket alignment on reinstall.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered by 5 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for \u003cstrong\u003eCarrier PH4GNAA42000AA\u003c\/strong\u003e packaged heat pump units. This transformer is also used across a broad range of Carrier, Bryant, and Payne furnaces, packaged units, RTUs, and heat pumps sharing the same 75VA 208\/240\/480V-to-24V specification — always verify your unit's data plate voltage and VA rating before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641231200627,"sku":"CARRIE-PH4GNAA42000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641231233395,"sku":"CARRIE-PH4GNAA42000AA-TRANSFORMER-HT01BD242-GEN","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD242_1797be9c-4fa8-44ab-b9ed-d7dce90ca6f2.jpg?v=1782943319","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnaa42000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}