OEM Carrier Transformer 40VA 120V/24V for Model LC748LCCSRLP2600

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier LC748LCCSRLP2600. The transformer steps down line voltage from 120V to 24V AC to power the entire low-voltage control circuit — including the thermostat, control board, contactor coil, and all safety switches. When this component fails, the system goes completely unresponsive: the thermostat goes blank, the unit won't call for heating or cooling, and no control signals can pass through the system. It is often the first component to check when nothing works at all.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BD702 | Factory-matched output voltage and VA capacity for full control circuit load
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can overheat, trip internal thermal fuses, or damage sensitive control boards over time.
• Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label or photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse when ordered before the daily cutoff.

Compatibility: Designed for the Carrier LC748LCCSRLP2600. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. If you're unsure of fitment, our parts specialists can confirm compatibility before you buy — no guesswork required.