{"product_id":"carrier-ph3gnaa36000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH3GNAA36000AA","description":"\u003ch1\u003eOEM Carrier 75VA Control Transformer HT01BD242 for Model PH3GNAA36000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH3GNAA36000AA\u003c\/strong\u003e packaged unit. The transformer steps down high-voltage line power — 208V, 240V, or 480V primary — to the 24VAC secondary voltage that powers your entire low-voltage control circuit: thermostat, contactor coil, control board, and safety switches. When this transformer fails, the result is a completely unresponsive system — no thermostat response, no contactor pull-in, nothing. A failed transformer is often misdiagnosed as a control board fault, making it one of the first components to verify during a no-power diagnostic.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208\/240\/480V | 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 is a genuine Carrier OEM transformer wound to exact VA and voltage tolerances. Undersized or off-tolerance aftermarket transformers can sag under load, causing erratic control board behavior, nuisance lockouts, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: multimeter (verify 24VAC output after install), screwdriver, wire stripper. Always verify primary voltage tap matches your supply voltage before energizing. Label all wires before disconnecting the old unit.\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 Direct OEM replacement for \u003cstrong\u003eCarrier PH3GNAA36000AA\u003c\/strong\u003e packaged unit. Verify your unit's supply voltage (208\/240V or 480V) matches the correct primary tap before installation. Compatible across Carrier air conditioners, furnaces, heat pumps, and packaged RTU applications using the HT01BD242 specification. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641361518963,"sku":"CARRIE-PH3GNAA36000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641361551731,"sku":"CARRIE-PH3GNAA36000AA-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_8ccbd3f3-ce62-4fd4-a5f0-f52371605e61.jpg?v=1782943275","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3gnaa36000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}