{"product_id":"carrier-c4850c50ay05161-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50AY05161 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier Control Circuit Transformer 40VA for Model C4850C50AY05161\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified step-down transformer for the \u003cstrong\u003eCarrier C4850C50AY05161\u003c\/strong\u003e packaged unit. The transformer converts 120V line voltage down to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the result is total control circuit shutdown: the thermostat goes blank, the system won't respond to any call for heating or cooling, and no components can energize. A failed transformer is often mistaken for a bad control board, making correct diagnosis critical before replacing more expensive parts.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Class 2 transformer | OEM part number HT01BD236 | Factory-matched output for Carrier low-voltage control circuits\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound to exact Carrier factory specifications, ensuring stable 24V output under full control circuit load. Off-brand transformers frequently deliver inconsistent voltage, causing nuisance lockouts, erratic thermostat behavior, and premature contactor coil failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Label or photograph all low-voltage wire connections prior to removal. Secure all wire nuts after reinstallation and confirm 24V output before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before 3 PM ship the same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eC4850C50AY05161\u003c\/strong\u003e packaged unit. Always verify the transformer's VA rating and primary\/secondary voltage on your unit's wiring diagram or data plate before ordering to ensure a correct fit. Have your model and serial number ready — our technical team is available to confirm fitment before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909808148851,"sku":"CARRIE-C4850C50AY05161-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909808181619,"sku":"CARRIE-C4850C50AY05161-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_17995916-c36d-47ee-998a-e859bb4d994e.jpg?v=1782899139","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay05161-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}