{"product_id":"carrier-subclr50hj440030-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — SUBCLR50HJ440030","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 208\/240V to 24V for Model SUBCLR50HJ440030\u003c\/h1\u003e\u003cp\u003eThis is the genuine OEM Carrier control transformer (part number \u003cstrong\u003eHT01BD209\u003c\/strong\u003e), the factory-specified replacement for the \u003cstrong\u003eSUBCLR50HJ440030\u003c\/strong\u003e. The transformer steps down line voltage from 208\/240V to the 24V needed to power your thermostat, control board, and all low-voltage system components. When this part fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat display, no contactor pull-in, and no heating or cooling whatsoever. A quick 24V check at the transformer's secondary terminals with a multimeter will confirm whether this part is the culprit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 208\/240V Primary | 24V Secondary | 40VA rated | 50\/60 Hz | Class 2 control transformer | Replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact factory VA ratings, ensuring the secondary stays at a stable 24V under full load. Undersized or off-brand units can sag under load, causing intermittent lockouts, nuisance tripping, and premature control board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 2\/5\u003c\/strong\u003e — Shut off all power to the unit before starting. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper, and insulated terminals. Label each wire before disconnecting. Verify 24V output at secondary terminals before closing the panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Ships same business day from our warehouse — in stock and ready to go.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM fit for Carrier model \u003cstrong\u003eSUBCLR50HJ440030\u003c\/strong\u003e. Cross-references HT01BD207, HT01CN232, and 9076-00. Always verify your unit's existing transformer specs (input voltage, output voltage, and VA rating) against your data plate before ordering. Our parts specialists are available to confirm fitment — just reach out before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640290726259,"sku":"CARRIE-SUBCLR50HJ440030-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640290759027,"sku":"CARRIE-SUBCLR50HJ440030-TRANSFORMER-HT01BD209-GEN","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-transformer-HT01BD209_629e2810-9ff3-4956-ba9d-3c53bdd10449.jpg?v=1775025830","url":"https:\/\/nationalhvacparts.com\/products\/carrier-subclr50hj440030-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}