{"product_id":"carrier-c50a303064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A303064","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C50A303064\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# HT01BD702) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A303064\u003c\/strong\u003e commercial packaged rooftop unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coils, and all low-voltage safety circuits. When it fails, absolutely nothing in the control system responds — no thermostat display, no contactor pull-in, no ignition sequence. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 transformer | Factory-matched OEM replacement | Part# HT01BD702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control circuit. Undersized or off-tolerance generic units can cause erratic low-voltage behavior, nuisance tripping, or premature secondary burnout — especially under the full contactor coil load of a commercial rooftop unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Verify 24V output at secondary terminals after installation before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC50A303064\u003c\/strong\u003e commercial rooftop packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you purchase — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909695689075,"sku":"CARRIE-C50A303064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909695721843,"sku":"CARRIE-C50A303064-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_bd0d6ae8-3320-45dc-aeb8-989bff940e9c.jpg?v=1782940441","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a303064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}