OEM Carrier Control Transformer 40VA 120V/24V for Model HGRH50HJ441043

This is the factory OEM replacement transformer (part number HT01BD242) for the Carrier HGRH50HJ441043 unit. The control transformer steps down 120V line voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the system goes completely silent: the thermostat display may go blank, the contactor won't pull in, and no heating or cooling operation can begin. A failed transformer is one of the most common causes of a completely unresponsive HVAC system.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD242 | Factory-matched electrical characteristics for reliable control circuit operation
• OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage specifications. Undersized or off-tolerance generic transformers can overload and burn out quickly, especially when multiple 24V accessories (humidistats, zone controllers) are on the circuit.
• Install difficulty: 2/5 — Shut off all power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before disconnecting. Verify 24V output with a multimeter after installation before closing the panel.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model HGRH50HJ441043. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or existing transformer label before ordering. Our fitment team is available to verify compatibility prior to purchase — don't guess on a control circuit part.