{"product_id":"carrier-c4850c48zt105610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C48ZT105610 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C48ZT105610\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C48ZT105610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire control circuit — including the thermostat, contactor coil, gas valve solenoid, and control board. When this component fails, absolutely nothing in the low-voltage control circuit responds: the thermostat goes blank or unresponsive, the system won't call for heating or cooling, and no safety controls can operate. A blown transformer is often the first clue when a system is completely \"dead\" despite line voltage being present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | Hardwired lead connection | 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 voltage specifications for the C4850C48ZT105610 control board load. Undersized or off-tolerance generic units can overheat, trip their internal breaker repeatedly, or fail to sustain 24V under full control-circuit load — leading to intermittent lockouts and nuisance service calls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire strippers, multimeter (confirm 0V before touching leads). Photograph existing wiring before disconnecting. Match primary and secondary lead colors exactly on reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before 3PM ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed and tested for the Carrier \u003cstrong\u003eC4850C48ZT105610\u003c\/strong\u003e packaged unit. Always verify your existing transformer's VA rating and input\/output voltages on the unit data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909848093043,"sku":"CARRIE-C4850C48ZT105610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909848125811,"sku":"CARRIE-C4850C48ZT105610-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_02969832-9f76-4013-a5a9-054f27486ab3.jpg?v=1782899096","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zt105610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}