{"product_id":"carrier-c4850c48zw075610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C48ZW075610 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48ZW075610\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC4850C48ZW075610\u003c\/strong\u003e packaged unit control circuit. The transformer steps down 120V line voltage to the 24V AC signal used by your thermostat, contactor coil, and all low-voltage controls. When it fails, the entire control circuit loses power — resulting in a blank thermostat display, an unresponsive system, or a tripped secondary fuse. If your unit appears completely dead despite confirmed line voltage, a failed transformer is one of the first components to test.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory OEM replacement for part# HT01BD236 | Matches original mounting footprint and terminal configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine OEM Carrier part, wound to exact VA and voltage specifications. Generic transformers may run hot, deliver inconsistent secondary voltage, or fail prematurely — causing nuisance lockouts and possible downstream control board damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off line voltage at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Test secondary voltage output (should read 24–28V AC) before reassembling. Photograph all wiring connections prior to removal.\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 as a direct OEM replacement for Carrier model \u003cstrong\u003eC4850C48ZW075610\u003c\/strong\u003e packaged units. Verify your existing transformer's VA rating and primary\/secondary voltages against your unit's data plate before ordering. Not sure it fits? Our HVAC parts team verifies fitment before you buy — contact us before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909847437683,"sku":"CARRIE-C4850C48ZW075610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909847470451,"sku":"CARRIE-C4850C48ZW075610-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_675b88ce-1232-4f18-9ce6-2e6cceed6fae.jpg?v=1782899098","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zw075610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}