{"product_id":"carrier-c4850c50aj02051-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V\/24V for C4850C50AJ02051","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50AJ02051\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50AJ02051\u003c\/strong\u003e packaged unit. The transformer steps down line voltage (120V) to the 24V signal voltage required by the thermostat, control board, contactor coil, and all other low-voltage control circuit components. When this transformer fails, the entire control circuit goes dead — your thermostat shows no power, the system won't respond to any call for heating or cooling, and a multimeter at the secondary terminals will read 0V instead of the expected 24–28V.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40 VA rating | Primary: 120V | Secondary: 24V | Class 2 control transformer | OEM part number HT01BD236 | Factory foot-mount configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is the genuine factory OEM unit built to Carrier's exact VA rating and insulation class. Generic transformers frequently run under-rated VA, causing thermal overload failures within one season — especially in multi-stage or heat pump systems drawing close to the transformer's full capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or spade connectors. Label all wires before disconnecting. Verify fuse or breaker on the 24V secondary circuit before condemning the transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM EST ship the 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\u003eC4850C50AJ02051\u003c\/strong\u003e packaged unit. Before ordering, confirm your existing transformer's VA rating and primary\/secondary voltages on the unit's wiring diagram or data plate. OEM part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e can be cross-referenced directly for a confirmed fit. Need help verifying compatibility? Our HVAC parts specialists confirm fitment before you order — no guesswork.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909846225267,"sku":"CARRIE-C4850C50AJ02051-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909846258035,"sku":"CARRIE-C4850C50AJ02051-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_a674cfca-6aee-44d0-8055-1e54dd7fc305.jpg?v=1782940114","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50aj02051-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}