{"product_id":"carrier-gb1aav048135acja-transformer-h2usbz","title":"OEM Carrier Transformer 40VA 120\/24V for GB1AAV048135ACJA","description":"\u003ch1\u003eOEM Carrier Control Transformer 40VA 120V\/24V for Model GB1AAV048135ACJA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement control transformer (part# \u003cstrong\u003eHT01BC116\u003c\/strong\u003e) is the factory-specified unit for the \u003cstrong\u003eCarrier GB1AAV048135ACJA\u003c\/strong\u003e gas furnace. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, gas valve, and all low-voltage control circuits. When it fails, nothing in the system responds — the thermostat goes dark, the furnace won't call for heat, and no error codes are generated because the board itself has no power. A blown fuse on the secondary side or a shorted control wire are common root causes; always diagnose before replacing.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rating | Primary: 120VAC | Secondary: 24VAC | OEM part number HT01BC116 | Factory-matched output for stable low-voltage control circuit operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e The OEM HT01BC116 transformer delivers a tightly regulated 24V output under load, protecting sensitive control boards and gas valves. Generic transformers can sag under full VA draw, causing intermittent lockouts and premature board failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Verify primary and secondary voltages with a meter after installation before restoring full system operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty included. In-stock units ship same business day from our warehouse when ordered before 3PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the Carrier \u003cstrong\u003eGB1AAV048135ACJA\u003c\/strong\u003e gas furnace. Verify existing transformer VA rating and voltage markings on your unit's data plate before ordering to confirm fitment. The GB1AAV048135ACJA is a 4-ton, 135,000 BTU upflow\/horizontal gas furnace — the 40VA transformer is standard for this configuration. Have questions about fitment? Our HVAC parts specialists verify compatibility before you order — just reach out via chat or phone.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909416243571,"sku":"CARRIE-GB1AAV048135ACJA-TRANSFORMER-HT01BC116","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909416276339,"sku":"CARRIE-GB1AAV048135ACJA-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_b1d12715-3bd8-431b-9b25-9fbf44949d6b.jpg?v=1782938729","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav048135acja-transformer-h2usbz","provider":"National HVAC Parts","version":"1.0","type":"link"}