OEM Carrier Transformer 40VA 120V–24V for Model HGRH50HJ441040

This is the factory OEM replacement transformer (part number HT01BD242) for the Carrier HGRH50HJ441040. The control transformer steps down line voltage (120V) to the 24V AC signal required to power your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any call for heating or cooling, and no contactors or gas valves will energize. It's often the first component to check when nothing at all appears to work.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory-matched OEM design | Part number HT01BD242 — direct drop-in replacement with no modification required
• OEM vs Generic: OEM transformers from Carrier are wound to exact VA and voltage tolerances, protecting sensitive control boards from over- or under-voltage. Off-brand substitutes frequently drift outside spec, risking downstream board damage that costs far more than the part itself.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all low-voltage wiring connections before removal to ensure correct reinstallation.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier HGRH50HJ441040. Always verify the VA rating and primary/secondary voltages on your existing transformer's label before ordering to confirm fitment. Our parts specialists are available to verify compatibility before you buy — no guesswork, no returns hassle.