OEM Carrier 40VA Control Transformer HT01BD702 for Model LC948LCFSRMT600

This OEM control transformer (part number HT01BD702) is the factory-specified replacement for the Carrier LC948LCFSRMT600 system. The transformer steps down line voltage from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board logic. When this component fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to calls for heating or cooling, and nothing powers on despite line voltage being present at the unit.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory OEM part number HT01BD702 | Direct drop-in replacement with matching mounting footprint and wire leads
• OEM vs Generic: The OEM HT01BD702 transformer is wound to exact factory VA and voltage tolerances, ensuring stable 24V output under full control circuit load. Generic transformers often run under-rated VA, causing voltage sag that can damage control boards and contactors over time.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to verify 24V output after install. Label or photograph all low-voltage wire connections before disconnecting the old transformer.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier LC948LCFSRMT600. Always verify the 40VA rating and 120V/24V configuration against your unit's data plate and wiring diagram before ordering. If you need help confirming fitment, our HVAC parts specialists are available to verify compatibility before you buy — same-day shipping means you're back up and running fast.