{"product_id":"payne-pa3gna042000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V\/24V for PA3GNA042000AA","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA3GNA042000AA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003ePayne PA3GNA042000AA\u003c\/strong\u003e packaged air conditioning system. The transformer steps down line voltage (120V) to the 24V signal voltage required by the control board, thermostat, and all low-voltage components. When this part fails, the entire control circuit goes dead — the thermostat loses power, the system will not respond to any calls for cooling or heating, and nothing operates. It is one of the first components to check when a system shows absolutely no response.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Factory-matched OEM design | OEM part number HT01BD209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Payne transformer built to exact factory VA and voltage specifications. Generic transformers may be under-rated for VA load, leading to overheating, nuisance tripping of the internal thermal fuse, and repeat failures within one season.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter to confirm zero voltage before touching wires. Always label or photograph all low-voltage wiring before disconnecting the old transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and factory-specified for the \u003cstrong\u003ePayne PA3GNA042000AA\u003c\/strong\u003e packaged unit. Confirm your existing transformer is rated 40VA 120V\/24V by checking the data label on the transformer body before ordering. If you have any questions about fitment, our HVAC parts specialists verify compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908906766707,"sku":"PAYNE-PA3GNA042000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908906799475,"sku":"PAYNE-PA3GNA042000AA-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_da1d1d10-f41c-4a18-8912-da74f85fdf76.jpg?v=1780718953","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa3gna042000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}