OEM Carrier Transformer 40VA 120V/24V for Model HGRH50HJ441042

This is the factory OEM replacement transformer (part number HT01BD242) for the Carrier HGRH50HJ441042. The transformer steps down line voltage from 120V to 24V AC to power the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the system won't call for heating or cooling, and you may detect a burned or overheated odor near the air handler or furnace cabinet.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD242 | Factory-matched to Carrier control circuit requirements
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances Carrier specifies. Undersized or off-brand transformers can overheat under combined control loads, blow internal fuses, and damage downstream boards — often costing far more than the transformer itself.
• Install difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before starting. Tools needed: Phillips and flathead screwdrivers, multimeter, wire nuts or spade connectors. Label or photograph all low-voltage wiring before disconnecting. Replacement typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier HGRH50HJ441042. Verify your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — zero guesswork, guaranteed correct part.