{"product_id":"carrier-ph4gnaa30000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GNAA30000AA","description":"\u003ch1\u003eOEM Carrier Transformer 75VA 208\/240\/480V to 24VAC for Model PH4GNAA30000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD242) is the factory-specified control-circuit transformer for the \u003cstrong\u003eCarrier PH4GNAA30000AA\u003c\/strong\u003e packaged heat pump\/RTU. The transformer steps down high-voltage line power — 208V, 240V, or 480V primary — to the 24VAC secondary signal that energizes your thermostat, contactor coils, gas valve, and control board. When this part fails, \u003cstrong\u003enothing in the system responds\u003c\/strong\u003e: the thermostat goes dark, the unit won't call for heating or cooling, and you may measure 0VAC on the 24V circuit. This is the first component to check after a blown control fuse.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA power rating | Input: 208\/240\/480V primary | Output: 24VAC secondary | 50\/60 Hz | Foot-mount configuration | OEM part #HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA tolerances — critical for protecting downstream boards and contactors. An undersized or off-tolerance aftermarket unit can over-heat and damage control components far more expensive than the transformer itself.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and verify zero voltage with a multimeter before touching any wiring. Label all low-voltage leads before removal. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade terminals. Always test 24VAC output before buttoning up the cabinet.\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.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Directly replaces the factory transformer in the Carrier \u003cstrong\u003ePH4GNAA30000AA\u003c\/strong\u003e packaged unit. This part is also used across multiple Carrier, Bryant, Payne, and ICP\/Heil\/Tempstar platforms that share the same 75VA, multi-tap primary specification — always verify your unit's data plate voltage and VA requirement before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641235853683,"sku":"CARRIE-PH4GNAA30000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641235886451,"sku":"CARRIE-PH4GNAA30000AA-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_b25dca2d-c8c9-4cf5-a4a8-7d26704dbce6.jpg?v=1782943317","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnaa30000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}