{"product_id":"carrier-c48a504051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C48A504051","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C48A504051\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C48A504051\u003c\/strong\u003e packaged unit. The transformer steps down line voltage from 120V to the 24V AC required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat will appear unresponsive, the system won't call for heating or cooling, and nothing will happen when you adjust the setpoint. It is often the first component to check when the system is completely unresponsive with no error codes displayed.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory-matched output for low-voltage control circuits | OEM part number HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit is wound and tested to Carrier's exact VA rating and insulation class. Undersized or off-brand transformers can sag under load, causing erratic contactor chatter, nuisance lockouts, and premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and confirm zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, wire nuts or spade connectors, multimeter to verify 24V output after installation. Photograph all wiring connections before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff 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\u003eC48A504051\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate or the transformer label before ordering. If you are unsure of fitment, our technical team is available to confirm compatibility before you purchase. In stock and ready to ship today — get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909730947443,"sku":"CARRIE-C48A504051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909730980211,"sku":"CARRIE-C48A504051-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_9918019e-19c0-4ec4-a929-9e07ce0b1c85.jpg?v=1782940212","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c48a504051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}