{"product_id":"carrier-ph3geaa48000aa-transformer-h2uxan","title":"OEM Carrier 40VA Transformer 24V Control Circuit — PH3GEAA48000AA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model PH3GEAA48000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM replacement control transformer for the \u003cstrong\u003eCarrier PH3GEAA48000AA\u003c\/strong\u003e packaged HVAC unit. The transformer steps down the 120V line voltage to the 24V signal used by your thermostat, control board, contactor coils, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system will not respond to any call for heating or cooling, and there is no low-voltage output at any terminal. This is one of the first components to check when a unit shows zero response across the board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Numbers: HT01BC701 \/ HT01BD242 | Factory-matched windings and insulation class\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances for the Carrier PH3GEAA48000AA platform. Generic substitutes frequently run under-rated VA, causing thermal overloads and repeat failures — especially in systems with multiple 24V accessories like humidifiers, zone boards, or UV lights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Photograph all wire connections before removal. Confirm secondary output voltage with a multimeter after installation before closing the cabinet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the \u003cstrong\u003eCarrier PH3GEAA48000AA\u003c\/strong\u003e packaged unit. Cross-references OEM part numbers HT01BC701 and HT01BD242 — both numbers supersede to the same component. Verify your existing transformer's input\/output voltage and VA rating on the data plate before ordering to ensure correct fitment. Have a question about compatibility? Our HVAC parts specialists verify fitment before you buy — contact us today and get your unit back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641395990899,"sku":"CARRIE-PH3GEAA48000AA-TRANSFORMER-HT01BC701","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641396023667,"sku":"CARRIE-PH3GEAA48000AA-TRANSFORMER-HT01BC701-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BC701_38c33268-66c4-4c6a-896e-93c0a8bc73cf.jpg?v=1775016477","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph3geaa48000aa-transformer-h2uxan","provider":"National HVAC Parts","version":"1.0","type":"link"}