{"product_id":"payne-pa4gnxa36000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA4GNXA36000AA","description":"\u003ch1\u003eOEM Payne Control Transformer 40VA for Model PA4GNXA36000AA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003ePayne PA4GNXA36000AA\u003c\/strong\u003e air conditioning system. The transformer steps down 120V line voltage to the 24V signal voltage required by your thermostat, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit goes dead — your thermostat loses power, nothing responds to a call for cooling or heating, and the system will not operate at all. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing more expensive parts.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Factory-matched OEM replacement | Part number HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound and insulated to exact factory specifications, ensuring proper VA capacity and thermal protection. Undersized or off-spec generic units can overheat, blow low-voltage fuses repeatedly, or fail to sustain voltage under full control circuit load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Photograph all wiring before disconnecting. Test secondary output (should read ~24–28V AC) after installation.\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 Engineered specifically for the \u003cstrong\u003ePayne PA4GNXA36000AA\u003c\/strong\u003e split-system air conditioner. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or component label before ordering. Our fitment team is available to confirm compatibility before you purchase — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908862071155,"sku":"PAYNE-PA4GNXA36000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908862103923,"sku":"PAYNE-PA4GNXA36000AA-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_7b843ebe-8c76-4d1a-99b7-f5e0bed27579.jpg?v=1780719021","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4gnxa36000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}