OEM Carrier Control Transformer 40VA 120V/24V for Model HGRH50HJ441041

This OEM replacement transformer (part number HT01BD242) is the factory-specified step-down transformer for the Carrier HGRH50HJ441041. It converts 120V line voltage to the 24V AC signal that powers the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, absolutely nothing in the control system responds: the thermostat goes blank, the system won't call for heating or cooling, and no 24V is measurable at the secondary terminals. It is often the first component to suspect when the entire unit goes silent.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD242 | Factory-matched for Carrier HGRH50HJ441041
• OEM vs Generic: OEM transformers are wound and rated to exact factory VA specifications, preventing overload and nuisance tripping of the internal fuse. Generic units often use lower-grade core materials, increasing heat buildup and shortening service life under continuous HVAC cycling loads.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter for voltage verification. Label or photograph all wire connections before removal. Installation typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty. Orders received before cutoff ship same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed specifically for the Carrier HGRH50HJ441041. Confirm your existing transformer's VA rating and input/output voltage on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our technical team is available to verify compatibility before you purchase — no guesswork required.