{"product_id":"carrier-ph4gnxb24000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V for PH4GNXB24000AA","description":"\u003ch1\u003eOEM Carrier 75VA Control Transformer HT01BD242 for Model PH4GNXB24000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement control transformer for the \u003cstrong\u003eCarrier PH4GNXB24000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down high-voltage line power — 208, 240, or 480V primary — to the \u003cstrong\u003e24V AC secondary\u003c\/strong\u003e voltage that powers your system's entire control circuit: thermostat, contactor coil, control board, and all low-voltage safety switches. When this transformer fails, the result is often a completely unresponsive system — no thermostat display, no staging, no response to calls for heating or cooling. A failed transformer can also blow the 3A control fuse repeatedly, making accurate diagnosis critical before replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | Primary: 208 \/ 240 \/ 480V | Secondary: 24V AC | 50\/60Hz | Foot-mount configuration | Factory-matched output tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers like this Carrier HT01BD242 are wound and rated to exact factory VA and voltage specifications. Generic replacements often run hot under load and fail prematurely — a critical risk in a 24\/7 commercial or residential packaged unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box before servicing. Tools needed: multimeter (to verify 24V output and check for shorted loads), flathead and Phillips screwdrivers, wire labels or tape. Identify and correct any shorted low-voltage wiring before installing the new transformer to prevent immediate re-failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e OEM factory warranty coverage. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for \u003cstrong\u003eCarrier PH4GNXB24000AA\u003c\/strong\u003e packaged heat pump units. This transformer is also cross-compatible with other Carrier, Bryant, and ICP family equipment requiring a 75VA, 208\/240\/480V-to-24V foot-mount transformer — always verify your unit's data plate voltage and VA rating before ordering. Our parts specialists are available to confirm fitment before you buy. \u003cstrong\u003eOrder today and enjoy same-day shipping from NationalHVACParts.com.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641229988211,"sku":"CARRIE-PH4GNXB24000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641230020979,"sku":"CARRIE-PH4GNXB24000AA-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_d5308e3f-b747-4d3f-a885-362983ef623b.jpg?v=1782943204","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnxb24000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}