{"product_id":"carrier-ph3gnaa30000aa-transformer-h3025m","title":"OEM Carrier Control Transformer 75VA 208\/240\/480V for PH3GNAA30000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V to 24V for Model PH3GNAA30000AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer is the factory-specified replacement for the \u003cstrong\u003eCarrier PH3GNAA30000AA\u003c\/strong\u003e packaged unit. The transformer steps down high-voltage primary power (208\/240\/480V) to the 24VAC signal required by the low-voltage control circuit — powering your thermostat, contactor coil, and all safety control boards. When it fails, the entire control circuit goes dark: the thermostat loses power, the system won't respond to any call for heating or cooling, and you may notice a faint burning smell or visible scorch marks on the transformer body.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480V | Secondary: 24VAC | 50\/60 Hz | Foot-mount configuration | OEM Part #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. Undersized or off-tolerance aftermarket units can overheat under full control-circuit load, tripping internal breakers or failing prematurely — especially on multi-stage systems drawing higher 24V current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Always disconnect main power at the disconnect box before servicing. Tools needed: multimeter (to confirm 0V before touching terminals), flathead and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all 24V low-voltage wires before removal. Torque terminals firmly to avoid loose connections that cause overheating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships 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 PH3GNAA30000AA\u003c\/strong\u003e packaged units. The 75VA rating and multi-tap primary (208\/240\/480V) make this transformer suitable for commercial and light-commercial voltage configurations. Always verify your unit's data plate voltage before ordering. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — call or chat today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641364795763,"sku":"CARRIE-PH3GNAA30000AA-TRANSFORMER-HT01BD242","price":99.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641364828531,"sku":"CARRIE-PH3GNAA30000AA-TRANSFORMER-HT01BD242-GEN","price":87.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD242_8ce1b069-398f-48c1-8eab-76e0fd0557a1.jpg?v=1775026231","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3gnaa30000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}