{"product_id":"payne-pa4gpxa36000aa-transformer-h30291","title":"OEM Payne Transformer 40VA 120V-24V for PA4GPXA36000AA","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA4GPXA36000AA\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM replacement transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) for the \u003cstrong\u003ePayne PA4GPXA36000AA\u003c\/strong\u003e split-system air conditioner. The transformer steps down the 120V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat goes blank, the system stops responding to calls for cooling or heating, and no fault codes are generated because the board itself loses power. It is one of the most commonly overlooked failure points in HVAC diagnostics.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Replaces OEM part number HT01BD209 | Factory-matched output tolerance for reliable low-voltage circuit performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM unit is wound and potted to Payne's exact VA and voltage specifications. Off-brand transformers frequently underrate their VA capacity, causing thermal cutout trips under normal load — especially when multiple low-voltage accessories are present on the 24V circuit.\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, wire stripper, multimeter (to confirm 24V output after install). Label or photograph all wire connections before removal. A failed transformer may have tripped a fuse — inspect the 3A control fuse on the board before condemning other components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM manufacturer 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 Designed and factory-specified for the Payne \u003cstrong\u003ePA4GPXA36000AA\u003c\/strong\u003e condensing unit. Always verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908860924275,"sku":"PAYNE-PA4GPXA36000AA-TRANSFORMER-HT01BD209","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908860957043,"sku":"PAYNE-PA4GPXA36000AA-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_afd3207e-10ea-4e7c-bfef-cfe23d271385.jpg?v=1780718893","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4gpxa36000aa-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}