{"product_id":"carrier-ph4gnxb42000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GNXB42000AA","description":"\u003ch1\u003eOEM Carrier 75VA Control Transformer HT01BD242 for Model PH4GNXB42000AA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM factory-specified control transformer for the \u003cstrong\u003eCarrier PH4GNXB42000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down the high-voltage primary supply (208\/240\/480V) to the 24V AC signal required to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the result is total system silence: no thermostat response, no fan, no compressor. It is one of the most critical components in the control circuit and is often overlooked during diagnosis.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480V | Secondary: 24VAC | 50\/60Hz | Foot-mount configuration | OEM part number HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Undersized or off-tolerance aftermarket transformers can overheat, trip thermal cutouts, and damage connected control boards — always match the OEM VA rating precisely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Requires disconnecting 120V–480V primary wiring. Always shut off the disconnect and verify zero voltage with a multimeter before touching any terminals. Tools needed: multimeter, screwdrivers, wire nuts or spade terminals. Label all wires before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct factory replacement for \u003cstrong\u003eCarrier model PH4GNXB42000AA\u003c\/strong\u003e packaged heat pump units. The 75VA rating and multi-tap primary (208\/240\/480V) make this transformer compatible across a range of Carrier packaged and split systems — always verify your unit's data plate voltage and VA spec before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641229267315,"sku":"CARRIE-PH4GNXB42000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641229300083,"sku":"CARRIE-PH4GNXB42000AA-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_ca665c4e-2ea3-4e57-a791-9eaf0baa8aa2.jpg?v=1782943325","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnxb42000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}