{"product_id":"carrier-c4850c50aj03561-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AJ03561 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AJ03561\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier C4850C50AJ03561\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V AC signal required by your thermostat, contactor coil, gas valve, and all other low-voltage control components. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for heating or cooling, and no safety functions will operate. It is often the first component to inspect when \u003cem\u003enothing\u003c\/em\u003e works but line power is confirmed present.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched footprint and lead configuration for drop-in installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and impedance specs required by Carrier controls. Undersized or off-spec generic transformers can cause erratic contactor chatter, nuisance lockouts, or premature control board failure — making the OEM choice a long-term investment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 24V output after install), wire stripper. Photograph or label all low-voltage wiring before disconnecting. Most installs complete in under 30 minutes.\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 climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier C4850C50AJ03561\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or wiring diagram inside the unit's access panel before ordering. If you have any questions about fitment, our HVAC parts specialists confirm compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909841342835,"sku":"CARRIE-C4850C50AJ03561-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909841375603,"sku":"CARRIE-C4850C50AJ03561-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_0053b319-eeb0-4595-b31f-4c1604bbb73c.jpg?v=1782938857","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj03561-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}