{"product_id":"carrier-ph4gpxb48000aa-transformer-h3025m","title":"OEM Carrier 40VA Control Transformer HT01BD242 for PH4GPXB48000AA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD242 for Model PH4GPXB48000AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD242\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier PH4GPXB48000AA\u003c\/strong\u003e packaged heat pump unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coils, and all low-voltage control circuits. When it fails, the entire control system goes dark — the thermostat won't respond, the unit won't energize, and nothing happens on a call for heating or cooling. This is often misdiagnosed as a failed control board, so always test the transformer first with a multimeter before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched OEM replacement | Designed for continuous-duty control circuit service\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to Carrier's exact VA and voltage tolerance specifications. Generic transformers may run under-spec under load, causing intermittent control failures and nuisance lockouts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify 24V output after installation. Label all wires before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003ePH4GPXB48000AA\u003c\/strong\u003e packaged heat pump units. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641220944243,"sku":"CARRIE-PH4GPXB48000AA-TRANSFORMER-HT01BD242","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641220977011,"sku":"CARRIE-PH4GPXB48000AA-TRANSFORMER-HT01BD242-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD242_88d313ac-c9f4-43ea-b153-19d105ceda02.jpg?v=1775016246","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph4gpxb48000aa-transformer-h3025m","provider":"National HVAC Parts","version":"1.0","type":"link"}