{"product_id":"carrier-subclr50hj440086-transformer-h30291","title":"OEM Carrier Control Transformer 40VA 208\/240V–24V — SUBCLR50HJ440086","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 208\/240V to 24V for Model SUBCLR50HJ440086\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier control transformer (part number HT01BD209) is the factory-specified replacement for the \u003cstrong\u003eCarrier SUBCLR50HJ440086\u003c\/strong\u003e. The transformer is the heartbeat of your HVAC system's low-voltage control circuit — it steps down 208\/240V line voltage to a steady 24V output that powers your thermostat, control board, contactor coil, and all safety circuits. When a transformer fails, the entire control system goes dark: the thermostat becomes unresponsive, the system won't energize, and no heating or cooling cycle can begin. Replacing a failed transformer promptly avoids misdiagnosis of more expensive components like the control board.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA capacity | 208\/240V primary input | 24V secondary output | 50\/60 Hz | Class 2 control transformer | Replaces legacy part numbers HT01BD207, HT01CN232, and 9076-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BD209 is wound to Carrier's exact VA rating and insulation class. Generic transformers may be under-rated for inrush current loads, causing nuisance trips or premature failure — especially in systems with multiple low-voltage loads on a single transformer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box before servicing. Tools needed: multimeter (to confirm primary voltage and verify 24V output after install), flathead and Phillips screwdrivers, wire nuts or spade connectors. Photograph all wiring before removal. Check for a shorted low-voltage load (e.g., a stuck contactor coil) before installing the new transformer, as a downstream short will destroy a new unit immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Direct OEM replacement for Carrier model \u003cstrong\u003eSUBCLR50HJ440086\u003c\/strong\u003e. Verify your unit's data plate confirms 208\/240V primary supply before ordering. Need fitment help? Our HVAC parts specialists confirm compatibility before you buy — order with confidence and get back to comfort fast.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640288596339,"sku":"CARRIE-SUBCLR50HJ440086-TRANSFORMER-HT01BD209","price":50.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640288629107,"sku":"CARRIE-SUBCLR50HJ440086-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_d8059fdd-6e5f-4595-bf62-e157babc6b80.jpg?v=1775025835","url":"https:\/\/nationalhvacparts.com\/products\/carrier-subclr50hj440086-transformer-h30291","provider":"National HVAC Parts","version":"1.0","type":"link"}