{"product_id":"payne-pa4gnxa42000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA4GNXA42000AA","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA4GNXA42000AA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA4GNXA42000AA\u003c\/strong\u003e air conditioning system. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, and control board. When this component fails, the entire control circuit loses power — meaning your thermostat goes blank, the system refuses to respond to any call for cooling or heating, and nothing works. It is often the first component to check when a system appears completely dead despite the breaker being on.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD209 | Factory-matched for Payne PA4GNXA42000AA control circuit requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM part manufactured to Payne's exact VA rating and insulation class. Generic transformers may be undersized in practice, causing overheating, blown fuses, or premature failure of downstream control components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after installation). Label or photograph existing wiring before removing the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the Payne \u003cstrong\u003ePA4GNXA42000AA\u003c\/strong\u003e split-system air conditioner. Verify your existing transformer's VA rating and primary\/secondary voltage from your unit's data plate or wiring diagram before ordering. Our team is available to confirm fitment — just reach out before you buy. Order today and your part ships same business day.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908861940083,"sku":"PAYNE-PA4GNXA42000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908861972851,"sku":"PAYNE-PA4GNXA42000AA-TRANSFORMER-HT01BD209-GEN","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_29cdc635-9165-4adc-be76-9faa8d406c4e.jpg?v=1780719023","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4gnxa42000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}