OEM Carrier Transformer 40VA 120V to 24V for Model HGRH50HJ441646

This is the factory OEM replacement transformer (part number HT01BD242) for the Carrier HGRH50HJ441646. The transformer steps down line voltage (120V) to the 24V AC signal used by your thermostat, control board, contactor coil, and all low-voltage control circuits. When it fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and nothing happens when you adjust the setpoint. A failed transformer is often caused by a shorted low-voltage wire, so always check for wiring faults before installing a replacement.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD242 | Factory-matched output for full control circuit compatibility
• OEM vs Generic: This OEM unit is wound to Carrier's exact VA rating and insulation class, ensuring reliable low-voltage output under sustained load. Generic transformers frequently run at reduced VA capacity, causing voltage sag that confuses control boards and shortens contactor coil life.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify voltage is zero before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring connections before removal. Test secondary output (should read 24–28V AC) after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty against defects. Orders placed by 3 PM ship the same business day from our stocked warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier HGRH50HJ441646. Confirm your existing transformer's primary/secondary voltage and VA rating on its label before ordering to ensure proper fitment. Our parts specialists are available to verify compatibility prior to purchase — no guesswork required.