{"product_id":"payne-pa4gexa48000aa-transformer-h2uxan","title":"OEM Payne Transformer 40VA 120V-24V for PA4GEXA48000AA","description":"\u003ch1\u003eOEM Payne Transformer 40VA 120V to 24V for Model PA4GEXA48000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BC701\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA4GEXA48000AA\u003c\/strong\u003e split-system air conditioner. The transformer steps down line voltage from 120V to the 24V required by your system's control circuit, powering the thermostat, contactor coil, and control board. When the transformer fails, the entire low-voltage control circuit goes dead — the thermostat goes blank, the system will not respond to any calls for cooling or heating, and nothing operates. A failed transformer is often misdiagnosed as a bad control board, so always test transformer output voltage first.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | OEM part number HT01BC701 | Factory-matched output voltage tolerance for reliable low-voltage control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to Payne's exact VA and voltage specifications, ensuring stable 24V output under full load. Generic transformers often run undersized VA ratings, causing voltage sag that triggers nuisance lockouts and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Label or photograph all low-voltage wiring before disconnecting. Confirm 24V output after installation before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Payne \u003cstrong\u003ePA4GEXA48000AA\u003c\/strong\u003e (4-ton R-410A split-system condenser). Verify your unit's control transformer VA rating and primary voltage on the data plate before ordering. Our HVAC parts specialists are available to confirm fitment before you buy — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908863021427,"sku":"PAYNE-PA4GEXA48000AA-TRANSFORMER-HT01BC701","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908863054195,"sku":"PAYNE-PA4GEXA48000AA-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_b8bb1f2d-24e8-4872-92e5-e12b5bb5daa0.jpg?v=1780718888","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4gexa48000aa-transformer-h2uxan","provider":"National HVAC Parts","version":"1.0","type":"link"}