{"product_id":"carrier-c4850c50zn070500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50ZN070500 — Ships Today","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C50ZN070500\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZN070500\u003c\/strong\u003e packaged unit. The control circuit transformer steps down line voltage (120V) to the 24V signal voltage that powers the thermostat, contactor coil, gas valve, and control board. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may measure zero voltage at the 24V secondary terminals. A shorted transformer sometimes trips or blows the low-voltage fuse as well.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Primary: 120V AC | Secondary: 24V AC | Rating: 40VA | OEM Part Number: HT01BD236 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers from Carrier are wound to factory-specified VA ratings and include built-in thermal cutoffs that protect downstream control boards. Generic units often run marginal VA ratings that sag under peak load, causing nuisance lockouts and premature board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box and confirm with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, needle-nose pliers. Photograph all wiring connections before removal. Reconnect secondary (24V) leads first, then primary (120V).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier C4850C50ZN070500\u003c\/strong\u003e packaged unit. Verify your unit's data plate shows 120V primary input and confirm OEM part number HT01BD236 before ordering. If your transformer shows signs of burn marks or a blown low-voltage fuse, inspect the downstream wiring for shorts before installing the new unit to prevent repeat failure. Our parts specialists are available to verify fitment — order with confidence and get back up and running today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909770367347,"sku":"CARRIE-C4850C50ZN070500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909770400115,"sku":"CARRIE-C4850C50ZN070500-TRANSFORMER-HT01BD236-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-HT01BD236_44d96dad-2a13-471b-9cbe-914ae8321e74.jpg?v=1782939087","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn070500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}