OEM Carrier 40VA Control Transformer for Model HGRH50HJ441124

This is the factory-specified OEM replacement transformer (part number HT01BD242) for the Carrier HGRH50HJ441124. The control transformer steps line voltage (120V) down to the 24V signal voltage required to power your thermostat, contactor coil, and all low-voltage control circuits. When this transformer fails, the entire control system goes dark — the thermostat loses power, the system won't call for heating or cooling, and nothing responds. It is often the first component to check when the system appears completely unresponsive despite confirmed line voltage at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD242 | Factory-matched to Carrier HGRH50HJ441124 control circuit requirements
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for your unit. Undersized or off-spec generic transformers can overheat, trip their internal fuse repeatedly, or deliver unstable 24V that causes nuisance lockouts and board damage.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label and photograph all wire connections before removing the old transformer. Confirm primary and secondary terminals before energizing.
• Warranty: 1-year OEM factory warranty. In-stock and ships the same business day from our warehouse.

Compatibility: Designed for the Carrier HGRH50HJ441124. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. If your control fuse blows repeatedly after replacement, inspect downstream wiring for shorts before condemning the transformer. Our parts specialists are available to confirm fitment — reach out before you order.