{"product_id":"payne-pa4gexa42000aa-transformer-h2uxan","title":"OEM Payne Transformer 40VA 120V\/24V for PA4GEXA42000AA","description":"\u003ch1\u003eOEM Payne 40VA Control Transformer for Model PA4GEXA42000AA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# \u003cstrong\u003eHT01BC701\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003ePayne PA4GEXA42000AA\u003c\/strong\u003e air conditioner. The transformer steps down 120V line voltage to the 24V signal voltage required by the thermostat, contactor coil, and all low-voltage control components. When this part fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for cooling or heating, and no other components will energize. A failed transformer is often misdiagnosed as a thermostat or control board issue, making it a critical first diagnostic check.\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 for full control circuit compatibility\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer is wound to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip internal protection, or deliver inconsistent 24V output — causing erratic system behavior or repeat failures.\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 screwdriver, multimeter, wire stripper. Always confirm 24V output at secondary terminals after installation before restoring full power.\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 Designed as the direct OEM replacement for the \u003cstrong\u003ePayne PA4GEXA42000AA\u003c\/strong\u003e split-system air conditioner. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping means your repair won't wait.\u003c\/p\u003e","brand":"Payne","offers":[{"title":"OEM","offer_id":62908863152499,"sku":"PAYNE-PA4GEXA42000AA-TRANSFORMER-HT01BC701","price":34.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62908863185267,"sku":"PAYNE-PA4GEXA42000AA-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_88574b72-ad01-4c30-872d-53c871da07fe.jpg?v=1780719016","url":"https:\/\/nationalhvacparts.com\/products\/payne-pa4gexa42000aa-transformer-h2uxan","provider":"National HVAC Parts","version":"1.0","type":"link"}