{"product_id":"carrier-gb3aav036075aaja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120\/24V for GB3AAV036075AAJA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model GB3AAV036075AAJA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part number \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified control transformer for the \u003cstrong\u003eCarrier GB3AAV036075AAJA\u003c\/strong\u003e gas furnace. The transformer steps down line voltage from 120V to 24V AC, powering the entire low-voltage control circuit — including the thermostat, gas valve, inducer relay, and ignition control board. When this transformer fails, absolutely nothing responds: the thermostat goes blank, the furnace won't attempt ignition, and no error codes are generated because the control board itself has no power. A failed transformer is often misdiagnosed as a bad control board, so always test it first with a multimeter before replacing more expensive components.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | Class 2 control transformer | Direct OEM replacement for part number HT01BC116\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This factory OEM unit is wound to exact VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip their internal fuse, or deliver insufficient current to hold contactors and gas valves open — causing intermittent lockouts that are extremely difficult to diagnose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring connections before removing the old unit. The transformer mounts with one or two screws inside the blower compartment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Carrier \u003cstrong\u003eGB3AAV036075AAJA\u003c\/strong\u003e 80% AFUE gas furnace. Verify your existing transformer's VA rating and primary\/secondary voltages on the data plate or wiring diagram before ordering. If your unit has a blown transformer fuse or repeatedly fails transformers, inspect for shorted low-voltage wiring before installing the new unit. Questions about fitment? Our HVAC parts specialists confirm compatibility before you buy.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909396910451,"sku":"CARRIE-GB3AAV036075AAJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909396943219,"sku":"CARRIE-GB3AAV036075AAJA-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_63e48628-00a4-4551-b3bc-65ee6d8c7130.jpg?v=1782938748","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb3aav036075aaja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}