{"product_id":"carrier-c4850c50z2040900-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50Z2040900 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50Z2040900\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50Z2040900\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by the thermostat, control board, and all low-voltage system components. When this part fails, the entire control circuit goes dead — your thermostat will be unresponsive, and the system will not heat, cool, or respond to any inputs. A blown transformer is often caused by a short in the low-voltage wiring, so always inspect the 24V circuit before installing the replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Factory-matched OEM dimensions and lead configuration | 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 voltage tolerances for the Carrier C4850C50Z2040900. Generic units may underperform under load, causing nuisance lockouts or premature failure of the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring before disconnecting. After installation, verify 24–28V output across secondary leads before restoring full system power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 specifically for the Carrier \u003cstrong\u003eC4850C50Z2040900\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating (40VA) against your unit's data plate before ordering. If your low-voltage fuse keeps blowing after replacement, a wiring short may be present — our technical team can help you troubleshoot before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909804085619,"sku":"CARRIE-C4850C50Z2040900-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909804118387,"sku":"CARRIE-C4850C50Z2040900-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_81a98021-76e2-4a06-8d61-b33bb3d03217.jpg?v=1782899150","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z2040900-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}