{"product_id":"carrier-c4850c50ay02561-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50AY02561 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V\/24V for Model C4850C50AY02561\u003c\/h1\u003e\u003cp\u003eThis OEM step-down control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AY02561\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, nothing in the control system responds: the thermostat goes blank, the unit won't call for heating or cooling, and you may find a blown 3A fuse on the control board as a secondary symptom.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD236 | Factory-matched for Carrier packaged equipment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage specifications, ensuring stable 24V output under full load. Generic units often under-deliver VA, causing nuisance tripping, erratic contactor chatter, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Verify 24V output after installation before restoring full system power. Always check for a shorted wire in the low-voltage circuit that may have caused the original failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50AY02561\u003c\/strong\u003e packaged unit. Verify input voltage and VA rating on your unit's data plate before ordering. If you are unsure whether this part fits your exact serial number variant, our HVAC parts specialists are available to confirm fitment before you order — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909813490035,"sku":"CARRIE-C4850C50AY02561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909813522803,"sku":"CARRIE-C4850C50AY02561-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_22a039f0-1e61-422f-84ef-dead447722ef.jpg?v=1782899137","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay02561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}