{"product_id":"carrier-c4850c50aj02751-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C50AJ02751","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA for Model C4850C50AJ02751\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ02751\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 it fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and in some cases a blown fuse or tripped breaker on the secondary side is the first symptom you'll notice.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BD236 | Factory-matched impedance and thermal protection\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 this unit. Undersized or off-spec generic transformers can overheat, trip thermal cutoffs prematurely, or fail to sustain voltage under full control-circuit load — shortening the life of your control board and contactor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, and wire nuts. Photograph all wiring connections before disconnecting. Verify 24V output 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 against defects. 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 and tested for the Carrier \u003cstrong\u003eC4850C50AJ02751\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltage on the unit data plate or existing component label before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before every order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909844717939,"sku":"CARRIE-C4850C50AJ02751-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909844750707,"sku":"CARRIE-C4850C50AJ02751-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_3ed6f9c7-25de-46f7-8805-1ae008772fa1.jpg?v=1782939288","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj02751-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}