{"product_id":"carrier-gb1aav042091afja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120V-24V for GB1AAV042091AFJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer HT01BC116 for Model GB1AAV042091AFJA\u003c\/h1\u003e\u003cp\u003eThis OEM control transformer (part number \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified replacement for the \u003cstrong\u003eCarrier GB1AAV042091AFJA\u003c\/strong\u003e gas furnace. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire control circuit loses power: the thermostat goes blank, the system will not respond to any call for heat or cooling, and no components will energize. A failed transformer is often misdiagnosed as a control board failure, making it the smart first diagnostic step.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 transformer | Foot-mount configuration | OEM part number HT01BC116\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine Carrier OEM transformer wound to exact VA and voltage tolerance specifications. Generic transformers are frequently undersized or wound with lower-grade laminations, leading to overheating, nuisance tripping, and premature failure — especially in multi-stage systems with higher control circuit loads.\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, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wiring connections before disconnecting. Check for a short in the 24V circuit before installing to avoid blowing the new transformer immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects in materials and workmanship. Orders placed by 3 PM ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as the direct OEM replacement for the Carrier \u003cstrong\u003eGB1AAV042091AFJA\u003c\/strong\u003e gas furnace. Always verify your existing transformer's VA rating and primary\/secondary voltages on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — same-day shipping on all stocked OEM parts.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909423092083,"sku":"CARRIE-GB1AAV042091AFJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909423124851,"sku":"CARRIE-GB1AAV042091AFJA-TRANSFORMER-HT01BC116-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-HT01BC116_3661439a-7ee4-4e9a-93f2-49e00908a73b.jpg?v=1782939810","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav042091afja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}