{"product_id":"carrier-c4850c50zt105610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50ZT105610 | National HVAC Parts","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50ZT105610\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50ZT105610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by every component in the control circuit — thermostat, contactor coil, gas valve, and safety switches. When it fails, nothing in the system responds: the thermostat goes blank, the unit won't call for heating or cooling, and no fault codes appear because the board itself has lost power. A failed transformer is often misdiagnosed as a bad control board, making correct identification critical before replacing expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V | Secondary: 24V | Replaces OEM part number HT01BD236 | Factory-matched wire leads and mounting footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit meets Carrier's exact VA rating and insulation class, ensuring the 24V circuit maintains stable voltage under full load. Undersized or off-brand transformers can sag under load, causing intermittent lockouts and nuisance tripping of downstream fuses.\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 beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label or photograph all low-voltage wiring connections before removal to simplify reinstallation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eC4850C50ZT105610\u003c\/strong\u003e packaged unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating against your unit's wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists can confirm compatibility before you buy — same-day shipping available on all in-stock OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909768565107,"sku":"CARRIE-C4850C50ZT105610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909768597875,"sku":"CARRIE-C4850C50ZT105610-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_04a2a45b-41b5-4e70-abf7-8ea24fc10eb9.jpg?v=1782899264","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50zt105610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}