{"product_id":"carrier-c4850c48zg035500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V-24V for C4850C48ZG035500","description":"\u003ch1\u003eOEM Carrier Transformer 40VA 120V to 24V for Model C4850C48ZG035500\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# HT01BD236) is the factory-specified 24V control circuit transformer for the \u003cstrong\u003eCarrier C4850C48ZG035500\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control components. When the transformer fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any calls for heating or cooling, and no components will energize. This is one of the first components to check when a unit presents with a completely unresponsive control circuit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | Factory OEM part number HT01BD236 | Direct plug-and-play wiring match for C4850C48ZG035500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD236 transformer is wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can cause erratic board behavior, nuisance tripping, or premature board failure — making OEM the only recommended choice for this application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdriver, needle-nose pliers, multimeter. Label all low-voltage wires before removing. Verify 24V output with a multimeter after installation and before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed by 3PM local time 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\u003eC4850C48ZG035500\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909867164019,"sku":"CARRIE-C4850C48ZG035500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909867196787,"sku":"CARRIE-C4850C48ZG035500-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_634a76a1-091b-47b7-b3db-86e19ec4481a.jpg?v=1782939281","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zg035500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}