OEM Carrier Control Transformer 40VA 120V/24V for Model HGRH50HJ441045

This OEM Carrier control transformer (part number HT01BD242) is the factory-specified replacement for the HGRH50HJ441045 unit. The transformer steps down line voltage from 120V to the 24V required to power the control board, thermostat, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — your thermostat will appear unresponsive, the system won't call for heating or cooling, and there will be no activity from the control board whatsoever. A failed transformer is often misdiagnosed as a control board failure, so always test this component first with a multimeter before replacing more expensive parts.

• Specs: Input: 120VAC | Output: 24VAC | Rating: 40VA | OEM Part Number: HT01BD242 | Factory-matched to Carrier specifications
• OEM vs Generic: This OEM transformer meets Carrier's exact VA rating and insulation class requirements. Generic transformers frequently run under their rated VA capacity, causing nuisance tripping of the internal thermal overload and premature failure — especially under heavy control-circuit loads.
• Install Difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before disconnecting. The primary (120V) side must be handled with care even with the unit powered down — verify zero voltage with a meter before touching any terminals.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model HGRH50HJ441045. Verify your existing transformer's input/output voltage and VA rating on the data plate before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you purchase — no guesswork required.