OEM Carrier Control Transformer 40VA 120V/24V for Model HGRH50HJ441145

This is the factory OEM replacement transformer (part number HT01BD209) for the Carrier HGRH50HJ441145. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any calls for heating or cooling, and you may notice a burning smell or a tripped low-voltage fuse on the board.

• Specs: Input: 120VAC | Output: 24VAC | VA Rating: 40VA | OEM Part Number: HT01BD209 | Factory-matched windings and thermal overload protection
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications with built-in thermal overload protection. Generic alternatives often lack proper VA headroom, leading to premature failure and potential control board damage if the secondary side is overloaded.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removing the old transformer. Check and replace any blown 3A low-voltage fuse on the control board before powering up.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier HGRH50HJ441145. Verify input/output voltage and VA rating on your existing transformer's label before ordering. If your unit has repeated transformer failures, inspect the secondary wiring for shorts before installing the new part. Our fitment team is available to confirm compatibility prior to purchase — order with confidence and get your system back online today.