{"product_id":"carrier-c4850c50zt075610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZT075610 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50ZT075610\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50ZT075610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V to power the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, nothing responds: the thermostat goes blank, the system will not heat or cool, and there are no error codes because the control board itself has lost power. A failed transformer is often caused by a shorted control wire, a faulty contactor coil, or an overloaded 24V circuit — always inspect downstream components before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM transformer includes factory-calibrated thermal cutoff protection to prevent burnout from downstream wiring faults. Generic units frequently lack adequate overcurrent protection, leading to repeat failures and potential board damage.\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 nuts or spade terminals, multimeter. Verify 24V output with a multimeter after installation before restoring full power. Tip: check 24V circuit for shorts first or the replacement transformer will fail immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. 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 factory-specified for the \u003cstrong\u003eCarrier C4850C50ZT075610\u003c\/strong\u003e packaged unit. Confirm the OEM part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e against your unit's data plate or existing transformer label before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you order if you have any questions. In stock and ships today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909768794483,"sku":"CARRIE-C4850C50ZT075610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909768827251,"sku":"CARRIE-C4850C50ZT075610-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_492ff280-3243-4a48-8a23-0725aceea43c.jpg?v=1782899259","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zt075610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}