OEM Carrier Transformer 40VA 120V/24V for Model N6D48NG480091

This OEM replacement transformer (part number HT01BC116) is the factory-specified control circuit transformer for the Carrier N6D48NG480091 packaged unit. The transformer steps down line voltage (120V) to 24V AC to power the control board, thermostat, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — your thermostat display may go blank, the system will not respond to calls for heating or cooling, and no safety lockout codes will display because the board itself has no power.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched for Carrier packaged equipment
• OEM vs Generic: OEM transformers are wound and insulated to Carrier's exact VA and thermal specifications. Undersized or generic transformers can saturate under full control-circuit load, causing nuisance trips or premature burnout — especially when multiple zones or accessories share the 24V circuit.
• Install difficulty: 2/5 — Shut off all power to the unit before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all low-voltage wiring before disconnecting. Primary wires are line-voltage — confirm power is off with a non-contact tester.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before 3 PM EST ship same business day from our stocked warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model N6D48NG480091. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate before ordering to ensure correct fitment. Our HVAC parts specialists are available to confirm compatibility before you buy — reach out before you order and we'll verify the fit.