OEM Carrier 40VA Control Transformer HT01BD702 for Model LC748LCCSRMY2601

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier LC748LCCSRMY2601. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching components. When this transformer fails, the entire control circuit goes dead — your thermostat goes blank, the system won't respond to any calls for heating or cooling, and no error codes will display because the board itself has no power. A failed transformer is often misdiagnosed as a bad control board, so always verify 24V output at the transformer secondary before replacing more expensive components.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD702 | Factory-matched construction for reliable, long-term low-voltage supply
• OEM vs Generic: This OEM transformer is wound and insulated to Carrier's exact factory specifications, ensuring stable 24V output under full load. Generic transformers may under-deliver VA capacity, causing nuisance trips and premature control board failures due to voltage sag.
• Install difficulty: 2/5 — Disconnect power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire nuts or spade connectors. Photograph existing wiring before disconnecting. Swap primary and secondary leads to matching terminals and secure all connections firmly.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse.

Compatibility: Designed for the Carrier LC748LCCSRMY2601. Always verify your unit's data plate and existing transformer VA rating before ordering — installing an under-rated transformer will cause repeated failures. Our fitment team is available to confirm compatibility before you purchase. Order today and receive same-day shipping on all in-stock OEM parts.