{"product_id":"carrier-ph4gpxb42000aa-transformer-h3025m","title":"OEM Carrier Transformer 75VA 208\/240\/480V–24V for PH4GPXB42000AA","description":"\u003ch1\u003eOEM Carrier Control Transformer 75VA 208\/240\/480V to 24VAC — Model PH4GPXB42000AA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM replacement control transformer (Part #HT01BD242) for the \u003cstrong\u003eCarrier PH4GPXB42000AA\u003c\/strong\u003e packaged unit. The transformer steps down high line voltage (208\/240\/480V primary) to the 24VAC signal that powers your thermostat, contactor coil, and control board. When the transformer fails, the entire low-voltage control circuit goes dead — your thermostat goes blank, the system refuses to respond to any call for heating or cooling, and fuses or breakers may trip repeatedly. Replacing it restores full control circuit operation immediately.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 75VA capacity | 208\/240\/480V primary | 24VAC secondary | 50\/60Hz | Foot-mount configuration | OEM Part #HT01BD242\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA ratings and insulation class, ensuring the full 24V signal under load. Undersized or off-spec generic units can sag voltage under peak demand, causing erratic contactor chatter and nuisance lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit at the disconnect before starting. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wiring connections before removing the old transformer. Confirm primary voltage tap matches your supply voltage 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 Factory-specified replacement for Carrier model \u003cstrong\u003ePH4GPXB42000AA\u003c\/strong\u003e packaged units. Also fits a range of Carrier, Bryant, and ICP family equipment using the HT01BD242 transformer. Always verify your unit's supply voltage (208V, 240V, or 480V) against the primary tap setting before installation. Questions about fitment? Our parts specialists confirm compatibility before you order — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641221828979,"sku":"CARRIE-PH4GPXB42000AA-TRANSFORMER-HT01BD242","price":70.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641221861747,"sku":"CARRIE-PH4GPXB42000AA-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_0981f58a-89f0-4fc5-b75a-84efc8055ec5.jpg?v=1782943344","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gpxb42000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}