{"product_id":"carrier-c50a404064-transformer-h301d7","title":"OEM Carrier Transformer 40VA 120V\/24V for C50A404064 — HT01BD702","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C50A404064 — Part# HT01BD702\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# HT01BD702) is the factory-specified replacement for the \u003cstrong\u003eCarrier C50A404064\u003c\/strong\u003e commercial packaged unit. The transformer steps down 120V primary voltage to 24V secondary voltage, powering the low-voltage control circuit that connects your thermostat, contactor coil, and safety switches. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and no safety components can operate. It is often the first component to check when a unit shows absolutely no signs of life despite confirmed line voltage at the unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched output tolerance | Direct OEM replacement for 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 board. Undersized or off-tolerance generic units can cause nuisance tripping of the secondary fuse, erratic thermostat behavior, or premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always verify 24V output on 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\u003eC50A404064\u003c\/strong\u003e commercial packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltage on the data plate or wiring diagram before ordering. If your unit has a blown secondary fuse, diagnose the underlying short in the control circuit before replacing the transformer to prevent repeat failure. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — same-day shipping on all stocked OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909678813555,"sku":"CARRIE-C50A404064-TRANSFORMER-HT01BD702","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909678846323,"sku":"CARRIE-C50A404064-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_d84b7567-1041-414d-b9b4-ef45ee34f166.jpg?v=1782940532","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c50a404064-transformer-h301d7","provider":"National HVAC Parts","version":"1.0","type":"link"}