OEM Carrier Transformer 40VA 120V–24V for Model CLINK48TMFSRLDL611

This is the OEM replacement transformer (part number HT01BD702) for the Carrier CLINK48TMFSRLDL611 packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal required to power the control board, thermostat circuit, and all low-voltage safety controls. When this component fails, the entire control circuit goes dark — your thermostat will show no response, your system won't call for heating or cooling, and no fault codes will appear because the board itself has no power.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01BD702 | Factory-matched for Carrier packaged unit control circuits
• OEM vs Generic: The OEM HT01BD702 transformer is wound to Carrier's exact VA and impedance specifications, ensuring stable 24V output under full control-circuit load. Generic transformers with undersized VA ratings can sag under load, causing intermittent lockouts and nuisance tripping of the circuit breaker built into the secondary winding.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Always label low-voltage wiring before disconnecting. Verify primary fuse or breaker is intact before condemning the transformer.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed for the Carrier CLINK48TMFSRLDL611 packaged unit. Verify your existing transformer's primary voltage (120V), secondary voltage (24V), and VA rating (40VA) against your unit's data plate before ordering. If your system is completely unresponsive and the thermostat is blank, this transformer is the first component to test with a multimeter. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — contact us today.