{"product_id":"carrier-ph4gpaa30000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GPAA30000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V to 24V for Model PH4GPAA30000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer for the \u003cstrong\u003eCarrier PH4GPAA30000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down high-voltage line power (208\/240\/480V primary) to the 24V AC signal that powers your entire control circuit — thermostat, contactor coils, safety switches, and control board. When this transformer fails, the result is a completely unresponsive system: no thermostat communication, no staging, no heat or cool — as if the unit has no power at all. A failed transformer is often mistaken for a bad control board, making correct diagnosis critical before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480V, 50\/60Hz | Secondary: 24VAC | 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 factory VA and voltage tolerances. Generic transformers often run under-rated VA, causing thermal overload and repeat failures under full control-circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 3\/5\u003c\/strong\u003e — Requires disconnecting 120\/240V line-voltage wiring. Always shut off the disconnect and verify with a non-contact voltage tester before touching any wiring. Tools needed: multimeter, flathead and Phillips screwdrivers, needle-nose pliers. Photograph all wiring connections before removal.\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 for the Carrier \u003cstrong\u003ePH4GPAA30000AA\u003c\/strong\u003e packaged heat pump unit. Also cross-references to Carrier, Bryant, Tempstar, and ICP family HVAC systems using OEM part number \u003cstrong\u003eHT01BD242\u003c\/strong\u003e. Verify primary voltage (208\/240\/480V) matches your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641227334003,"sku":"CARRIE-PH4GPAA30000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641227366771,"sku":"CARRIE-PH4GPAA30000AA-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_66272270-4afd-4a76-b88d-53dfe6112b74.jpg?v=1782943333","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gpaa30000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}