{"product_id":"carrier-gb1aav024045agja-transformer-h3hvc4","title":"OEM Carrier 40VA Transformer 120V-24V for GB1AAV024045AGJA","description":"\u003ch1\u003eOEM Carrier 40VA Control Transformer 120V–24V for Model GB1AAV024045AGJA\u003c\/h1\u003e\u003cp\u003eThis OEM replacement transformer (part# HT01CN001) is the factory-specified control circuit transformer for the \u003cstrong\u003eCarrier GB1AAV024045AGJA\u003c\/strong\u003e gas furnace. Its job is to step down 120V line voltage to the 24V AC signal that powers your thermostat, control board, gas valve, and all low-voltage safety circuits. When this transformer fails, the entire control system goes dark — the thermostat loses power, the furnace will not attempt ignition, and nothing responds. It is one of the first components to check when a furnace shows zero activity at the thermostat.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01CN001 | Factory-matched impedance and thermal protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM unit includes the factory-spec thermal cutoff and tight voltage regulation required by the Carrier control board. Generic transformers frequently output slightly elevated voltages that can damage sensitive solid-state boards over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Shut off power at the breaker and confirm zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wiring connections before disconnecting. Typical swap time is 15–30 minutes for a competent DIYer.\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 climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for the \u003cstrong\u003eCarrier GB1AAV024045AGJA\u003c\/strong\u003e gas furnace. Always verify the 120V primary \/ 24V secondary 40VA rating against your unit's data plate before ordering. If you have any fitment questions, our HVAC parts specialists confirm compatibility before your order ships — no guesswork required.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909435642227,"sku":"CARRIE-GB1AAV024045AGJA-TRANSFORMER-HT01CN001","price":47.25,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909435674995,"sku":"CARRIE-GB1AAV024045AGJA-TRANSFORMER-HT01CN001-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-HT01CN001_0a40a624-f672-44f5-b08f-ee4b70144b22.jpg?v=1782899582","url":"https:\/\/nationalhvacparts.com\/products\/carrier-gb1aav024045agja-transformer-h3hvc4","provider":"National HVAC Parts","version":"1.0","type":"link"}