OEM Carrier Transformer 40VA 120V/24V for Model N6A48NG481455 (HT01BC116)

This is the factory OEM replacement transformer for the Carrier N6A48NG481455 packaged unit, OEM part number HT01BC116. The transformer steps down line voltage (120V) to the 24V AC signal required by the control circuit, thermostat, and low-voltage safety components. When this transformer fails, the entire control system loses power — symptoms include a completely unresponsive thermostat, no response to any call for heating or cooling, and tripped 3-amp control fuses that keep blowing on reset. A failed transformer is one of the most commonly misdiagnosed HVAC faults, often confused for a bad control board or thermostat.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BC116 | Factory-matched impedance and core construction for full control circuit stability
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerance specifications for the Carrier control board. Undersized or off-spec generic units can cause erratic thermostat behavior, nuisance tripping, and premature board damage — OEM is always the safer choice for the control circuit backbone.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wiring connections before removing the old transformer. Check and replace any blown control fuses (typically 3A) as part of the repair.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier N6A48NG481455 packaged gas/electric unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts team is available to confirm fitment — same-day shipping on orders placed before 3PM EST.