{"product_id":"carrier-ph4gpaa48000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GPAA48000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V to 24V for Model PH4GPAA48000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH4GPAA48000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down high-voltage supply power (208\/240\/480V primary) to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, and all safety controls. When this transformer fails, the result is a completely unresponsive unit: no call for heating or cooling, no fan operation, and no error codes displayed at the thermostat, since the control voltage itself is lost.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | 208\/240\/480V primary | 24VAC secondary | 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 the factory-matched OEM transformer. Generic alternatives often use lower-grade core laminations and loose VA tolerances, which can cause voltage sag under load — stressing contactors and control boards and shortening system life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — High-voltage wiring is involved. Always disconnect power at the disconnect box and verify zero volts with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, wire nuts, multimeter. Photograph all wiring connections before removal. Licensed HVAC technician installation is strongly recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory 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 OEM replacement for \u003cstrong\u003eCarrier model PH4GPAA48000AA\u003c\/strong\u003e packaged heat pump units. Also cross-references to Bryant and other ICP-family equipment using the HT01BD242 transformer specification. Always verify primary voltage on your unit's data plate matches 208\/240\/480V before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641225531763,"sku":"CARRIE-PH4GPAA48000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641225564531,"sku":"CARRIE-PH4GPAA48000AA-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_5dee5fcb-b771-4d5c-b608-6412abb6af5d.jpg?v=1782943338","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gpaa48000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}