{"product_id":"carrier-c4850c48zg040500-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C48ZG040500","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C48ZG040500\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C48ZG040500\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V primary) to the 24V secondary signal that powers your thermostat, control board, and all low-voltage control circuits. When it fails, the entire control system goes dark — the thermostat shows no power, relays won't energize, and the unit will not respond to any call for heating or cooling. It is often the first component to check when nothing works and your breaker has not tripped.\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 output for stable, consistent control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances required by the Carrier control board. Undersized or off-tolerance generic units can cause nuisance lockouts, erratic thermostat behavior, or premature control board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring before disconnecting. Verify 24V output with a multimeter after installation before restoring full power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock and ships the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed specifically for the \u003cstrong\u003eCarrier C4850C48ZG040500\u003c\/strong\u003e packaged unit. Confirm your existing transformer's VA rating and primary\/secondary voltages on the unit data plate before ordering. Our parts specialists are available to verify fitment — order with confidence and get your system back online fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909866148211,"sku":"CARRIE-C4850C48ZG040500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909866180979,"sku":"CARRIE-C4850C48ZG040500-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_06280290-6d10-4ee3-8f28-70cb60e4c3c6.jpg?v=1782940090","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c48zg040500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}