{"product_id":"carrier-ph4gnxb48000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GNXB48000AA","description":"\u003ch1\u003eOEM Carrier Transformer 75VA 208\/240\/480V–24V for Model PH4GNXB48000AA\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part #HT01BD242) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH4GNXB48000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down high-voltage primary power — 208, 240, or 480VAC — to a safe \u003cstrong\u003e24VAC secondary output\u003c\/strong\u003e that energizes the entire low-voltage control circuit, including the thermostat, contactor coil, reversing valve, and all safety controls. When this transformer fails, the result is typically a completely unresponsive system: no thermostat display, no fan, no compressor — nothing works because the 24V control circuit has lost its power source.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA rating | 208\/240\/480V primary | 24VAC secondary | 50\/60Hz | Foot-mount configuration | Factory-matched output tolerance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD242 is built to Carrier's exact VA rating and insulation class, ensuring the control circuit receives clean, stable 24V. Undersized or off-spec generic transformers can overheat, trip internal thermal cutouts, and cause intermittent control failures that are difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: multimeter (confirm 0V before touching), flathead and Phillips screwdrivers, wire labels or tape. Photograph all wiring connections before removal. Verify primary voltage tap matches your supply voltage. Foot-mount bracket bolts directly to the control board panel.\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 when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Factory-direct replacement for \u003cstrong\u003eCarrier PH4GNXB48000AA\u003c\/strong\u003e packaged heat pump units. Also cross-references to Carrier furnaces, air conditioners, and RTU applications sharing the HT01BD242 specification. Always verify your unit's data plate primary voltage (208V, 240V, or 480V) to confirm the correct tap is used after installation. Have a fitment question? Our HVAC parts specialists verify compatibility before you order — reach out before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641227825523,"sku":"CARRIE-PH4GNXB48000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641227858291,"sku":"CARRIE-PH4GNXB48000AA-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_f4587317-5bc2-413d-8ca1-b8ef0e5be7f9.jpg?v=1782943328","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gnxb48000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}