{"product_id":"carrier-ph3gnaa42000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH3GNAA42000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V–24V for Model PH3GNAA42000AA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier replacement transformer (part #HT01BD242) factory-specified for the \u003cstrong\u003eCarrier PH3GNAA42000AA\u003c\/strong\u003e packaged unit. The transformer steps down high-voltage primary power (208\/240\/480V) to the 24VAC secondary voltage that energizes the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the result is total loss of control: the thermostat goes dark, the system will not respond to any call for heating or cooling, and no safety circuit can function. It is often the first component to inspect when nothing works at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480VAC | Secondary: 24VAC | 50\/60Hz | Foot-mount configuration | OEM part #HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory-authorized OEM transformer is wound to Carrier's exact VA rating and insulation class. Undersized or off-tolerance aftermarket transformers overheat under real-world load, causing nuisance tripping or premature failure of the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: multimeter (verify 0V before touching terminals), flathead and Phillips screwdrivers, wire stripper, and electrical tape. Label all wires before removal. Verify primary voltage matches your supply before energizing.\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 Engineered as the direct OEM replacement for the \u003cstrong\u003eCarrier PH3GNAA42000AA\u003c\/strong\u003e packaged unit. Compatible across Carrier, Bryant, Payne, Tempstar, and Heil systems that specify HT01BD242. Always confirm primary voltage (208\/240\/480V) and VA rating (75VA) against your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641359159667,"sku":"CARRIE-PH3GNAA42000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641359192435,"sku":"CARRIE-PH3GNAA42000AA-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_d603f571-b0d4-4c80-ae84-01b41b59192d.jpg?v=1782943278","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3gnaa42000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}