{"product_id":"carrier-c4850c50z9090610-transformer-h302a1","title":"OEM Carrier 40VA 120V to 24V Control Transformer for C4850C50Z9090610 — Ships Today","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer for Model C4850C50Z9090610\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part# \u003cstrong\u003eHT01BD236\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier C4850C50Z9090610\u003c\/strong\u003e packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all other low-voltage control circuit components. When the transformer fails, the entire control circuit loses power — the result is a completely unresponsive system: no thermostat display, no contactor pull-in, and no call-for-heating or cooling response whatsoever.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | 120V primary \/ 24V secondary | Class 2 control transformer | Factory-matched for Carrier C4850C50Z9090610 packaged unit | OEM Part# HT01BD236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM transformers meet exact VA rating and insulation class required by Carrier's control circuit. Undersized or off-brand units can overheat, trip internal breakers prematurely, or fail to sustain voltage under full control-circuit load — leaving you chasing a misdiagnosis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Verify 24V output with a multimeter after installation before restoring full system power. Photograph all wiring connections prior to removal.\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 and factory-specified for the \u003cstrong\u003eCarrier C4850C50Z9090610\u003c\/strong\u003e packaged unit. Always confirm your unit's data plate matches the 120V primary \/ 24V secondary 40VA specification before ordering. Not sure about fitment? Our HVAC parts specialists verify compatibility before you buy — just reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909783212403,"sku":"CARRIE-C4850C50Z9090610-TRANSFORMER-HT01BD236","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909783245171,"sku":"CARRIE-C4850C50Z9090610-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_2259657e-599a-4ddc-abf4-2b1825b9cd00.jpg?v=1782899196","url":"https:\/\/nationalhvacparts.com\/products\/carrier-c4850c50z9090610-transformer-h302a1","provider":"National HVAC Parts","version":"1.0","type":"link"}