OEM Carrier 40VA Control Transformer HT01BC116 for Model N6D48NG480100

This OEM control transformer (part# HT01BC116) is the factory-specified replacement for the Carrier N6D48NG480100 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching circuits. When it fails, nothing in the control system responds — the thermostat goes blank, the system won't call for heating or cooling, and the unit sits completely dead despite having power. A blown transformer is often misdiagnosed as a failed control board, making correct identification critical before replacing more expensive components.

• Specs: Input: 120V AC | Output: 24V AC | 40VA rating | OEM part number HT01BC116 | Designed for Carrier packaged unit platform
• OEM vs Generic: OEM Carrier transformers are wound to exact VA tolerances and use the correct mounting footprint, ensuring the 24V output remains stable under full control-circuit load. Generic transformers may underperform at rated VA, causing nuisance lockouts or overheating on multi-zone control circuits.
• Install difficulty: 2/5 — Shut off all power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install and check for secondary shorts before energizing). Always inspect secondary-side wiring for shorts that may have caused the original transformer failure.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier N6D48NG480100 packaged unit. Verify the primary voltage (120V) and VA rating on your unit's data plate before ordering. If your application uses a 208/240V primary, do not substitute this unit. Our fitment team is available to confirm compatibility before you purchase — order with confidence and get your system back online today.