{"product_id":"carrier-c50a303564-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A303564","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD702 for Model C50A303564\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD702\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C50A303564\u003c\/strong\u003e commercial packaged unit. The transformer converts 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control system goes dead: the thermostat shows no power, nothing responds, and the system will not heat or cool.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary input | 24V secondary output | Single-phase | Designed to OEM factory tolerances for the C50A303564 control circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier part. Generic transformers may carry incorrect VA ratings or use lower-grade windings, which can cause nuisance tripping, overheating, or premature failure — especially under full control circuit load in a packaged commercial unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph existing wiring before disconnecting the primary and secondary leads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3PM ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC50A303564\u003c\/strong\u003e commercial rooftop\/packaged unit. Verify existing transformer VA rating and primary\/secondary voltages on the unit's data plate before ordering. If your low-voltage fuse is also blown, inspect for any short in the 24V circuit before installing the new transformer. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909695623539,"sku":"CARRIE-C50A303564-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909695656307,"sku":"CARRIE-C50A303564-TRANSFORMER-HT01BD702-GEN","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-control-HT01BD702_df3201e7-3c4d-4493-b008-2944f1afb508.jpg?v=1782940453","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a303564-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}