{"product_id":"carrier-hgrh50hj442378-transformer-h30291","title":"OEM Carrier Transformer 40VA 24V for HGRH50HJ442378 — HT01BD209","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model HGRH50HJ442378 — Part# HT01BD209\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part# \u003cstrong\u003eHT01BD209\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eHGRH50HJ442378\u003c\/strong\u003e system. The transformer steps incoming 120V line voltage down to the 24V AC that powers your thermostat, control board, contactor coil, and all low-voltage safety controls. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing works despite the unit having full line power. A blown transformer is often one of the first components to check when your HVAC system appears completely unresponsive.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 120V primary input | 24V secondary output | 40VA rated | Factory-matched OEM construction | Class 2 insulation | Compatible with standard screw-terminal control wiring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 transformer is wound to exact factory VA and voltage specifications, ensuring stable 24V output under full control circuit load. Generic transformers frequently run under-rated VA, causing voltage sag that triggers nuisance lockouts and premature control board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to confirm 24V output after install), wire nuts or terminal screws as needed. Label or photograph all low-voltage wiring connections before disconnecting the old unit.\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 cutoff ship same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eHGRH50HJ442378\u003c\/strong\u003e. Before ordering, verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating against your unit's data plate to confirm fitment. If you are unsure, our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909327442291,"sku":"CARRIE-HGRH50HJ442378-TRANSFORMER-HT01BD209","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909327475059,"sku":"CARRIE-HGRH50HJ442378-TRANSFORMER-HT01BD209-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-HT01BD209_dc313fc6-cdd3-4e96-ad5f-ac0691b08176.jpg?v=1782942616","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hgrh50hj442378-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}