{"product_id":"carrier-c4850c48zt075610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C48ZT075610 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C4850C48ZT075610\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48ZT075610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit loses power — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no relays or safety switches can operate. It is often the first component to inspect when nothing works at all.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V | Secondary: 24V | Class 2 control circuit transformer | Compact form factor for packaged unit installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit (HT01BD236) is wound to Carrier's exact VA rating and insulation class, ensuring the control board and contactor coil receive a stable, clean 24V signal. Undersized generic transformers can overheat under combined load, trip their internal fuse, or cause erratic low-voltage behavior across all connected components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdriver, multimeter (verify 0V before touching wires), wire nuts or spade connectors. Photograph all wiring connections before disconnecting the old unit. Verify primary and secondary voltages with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 Carrier \u003cstrong\u003eC4850C48ZT075610\u003c\/strong\u003e packaged unit. Always confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's wiring diagram or data plate before ordering. Our fitment team is available to verify compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909849272691,"sku":"CARRIE-C4850C48ZT075610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909849305459,"sku":"CARRIE-C4850C48ZT075610-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_01fc0d3e-1c0b-473e-9b36-38a05b06e51d.jpg?v=1782899092","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zt075610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}