{"product_id":"carrier-c4850c50zn040500-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZN040500 — HT01BD236 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50ZN040500\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC4850C50ZN040500\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire control circuit — including the thermostat, contactor coil, and control board. When it fails, the result is total system silence: no thermostat response, no fan, no heat or cooling. A blown transformer is often the first sign of a shorted control component downstream.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Factory-matched OEM replacement | Part# HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers are wound to exact VA and voltage tolerances for the C4850C50ZN040500's control board demands. Generic units frequently underperform on VA capacity, causing nuisance trips, overheating, or repeat failures if a downstream short exists.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdriver, multimeter (to verify 24V output and check for downstream shorts before energizing). Always check low-voltage wiring for shorts before installing a new transformer.\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 Designed for Carrier model \u003cstrong\u003eC4850C50ZN040500\u003c\/strong\u003e packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If you're replacing a failed transformer, always diagnose the 24V circuit for a short-to-ground before powering up — otherwise the new transformer will fail immediately. Our HVAC parts team is available to confirm fitment before you order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909775249779,"sku":"CARRIE-C4850C50ZN040500-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909775282547,"sku":"CARRIE-C4850C50ZN040500-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_00a31fe8-410f-4622-93c0-abc1c8c00769.jpg?v=1782899237","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zn040500-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}