{"product_id":"carrier-c4850c50ay05151-transformer-h302a1","title":"OEM Carrier Transformer 40VA 120V to 24V for C4850C50AY05151 — Ships Today","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model C4850C50AY05151\u003c\/h1\u003e\u003cp\u003eThis OEM Carrier transformer (part number \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eC4850C50AY05151\u003c\/strong\u003e packaged unit. The transformer steps line voltage (120V) down to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the entire system goes silent: no thermostat response, no fan, no heat or cooling. A failed transformer is often caused by a short in the control wiring or a failed component drawing excess current, so always inspect the low-voltage circuit before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | 120V primary \/ 24V secondary | OEM part number HT01BD236 | Factory-matched output for stable control voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers maintain tight voltage regulation under load, protecting sensitive control boards and thermostats. Generic units often produce voltage sag under full VA draw, leading to nuisance lockouts and premature board failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker and verify zero voltage with a multimeter before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Check for shorted control wiring before energizing the 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 Engineered specifically for the Carrier \u003cstrong\u003eC4850C50AY05151\u003c\/strong\u003e packaged unit. Verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909808279923,"sku":"CARRIE-C4850C50AY05151-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909808312691,"sku":"CARRIE-C4850C50AY05151-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_92524e25-c99a-4725-b7cc-e3bb6fd6946a.jpg?v=1782938975","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50ay05151-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}