OEM Carrier Transformer 40VA 120V/24V for Model CLINK48TMFSRMDL601

This is the factory OEM replacement transformer (part number HT01BD702) for the Carrier CLINK48TMFSRMDL601 packaged unit. The transformer is the backbone of your system's low-voltage control circuit — it steps incoming 120V line voltage down to the 24V signal voltage that powers the thermostat, control board, contactor coil, and all safety circuits. When this transformer fails, absolutely nothing responds: the thermostat goes dark, the system won't call for heating or cooling, and the control board produces no outputs. It's often the first component to suspect when a system appears completely dead despite confirmed power at the disconnect.

• Specs: Primary voltage 120V AC | Secondary voltage 24V AC | 40VA rating | Single-phase | Direct OEM replacement for part number HT01BD702
• OEM vs Generic: The OEM HT01BD702 is wound and potted to Carrier's exact VA rating and insulation class. Generic transformers frequently underrate their true VA capacity, causing thermal shutoff under normal control circuit load and premature failure — especially in units with multiple accessories or zone boards drawing 24V power.
• Install difficulty: 2/5 — Shut off power at the disconnect and confirm zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Total job time for an experienced tech: 15–20 minutes.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM drop-in for the Carrier CLINK48TMFSRMDL601 packaged unit. Always verify your unit's control circuit voltage and VA requirements on the data plate or wiring diagram before ordering. Our fitment team is available to confirm compatibility prior to purchase — same-day shipping on all in-stock orders placed before 3 PM local time.