OEM Carrier Transformer 40VA 120V/24V for Model HGRH50HJ441644

This OEM Carrier transformer (part number HT01BD242) is the factory-specified replacement for the HGRH50HJ441644 unit. The transformer steps down line voltage from 120V to the 24V AC signal required to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, the system goes completely unresponsive: the thermostat loses power, no calls for heating or cooling are processed, and the unit will not operate in any mode.

• Specs: Input voltage: 120V AC | Output voltage: 24V AC | Capacity: 40VA | OEM part number: HT01BD242 | Factory-matched output tolerance for stable low-voltage control
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact factory specification. Generic alternatives frequently underperform at peak load, causing nuisance tripping of the internal thermal fuse and premature control board damage — making OEM the only reliable long-term choice.
• Install difficulty: 2/5 — Shut off power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Verify 24V output at secondary leads with a multimeter after install before restoring full power. Always label and photograph wiring prior to disconnecting.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for Carrier model HGRH50HJ441644. Verify your existing transformer's input/output voltage and VA rating on the unit data plate or old transformer label before ordering. If your control board or thermostat also shows signs of damage from a failed transformer, inspect and test those components before powering the system back up. Our HVAC parts specialists are available to confirm fitment — order with confidence and get back to comfort fast.