{"product_id":"carrier-c4850c50z3030600-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Transformer for C4850C50Z3030600 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50Z3030600\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50Z3030600\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal needed to power your thermostat, control board, contactor coil, and all low-voltage control circuits. When it fails, the entire control circuit goes dark — your thermostat loses power, the system stops responding to calls for heating or cooling, and no diagnostic LEDs will illuminate on the control board. It is often the first component to test when absolutely nothing works.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched impedance and thermal protection | OEM part number HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance specifications for the \u003cstrong\u003eC4850C50Z3030600\u003c\/strong\u003e control circuit load. Generic transformers frequently underperform under sustained demand, leading to voltage sag, nuisance lockouts, and premature failure — especially in packaged units cycling frequently.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to confirm 24V output post-install). Label or photograph all low-voltage wiring before removing the old transformer. Incorrect wiring can damage the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. 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 for the Carrier \u003cstrong\u003eC4850C50Z3030600\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. If you're unsure about fitment, our HVAC parts specialists are available to 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":62909798875507,"sku":"CARRIE-C4850C50Z3030600-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909798908275,"sku":"CARRIE-C4850C50Z3030600-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_d9debe87-1b02-42f2-89df-642c85385f8d.jpg?v=1782899408","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z3030600-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}