OEM Carrier Control Transformer 40VA 120V/24V for Model C50A305064

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the C50A305064 commercial packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system will not call for heating or cooling, and no fault codes will display because the board itself has lost power.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 control transformer | Direct OEM replacement for part number HT01BD702
• OEM vs Generic: OEM Carrier transformers are wound to exact VA tolerances to protect downstream control boards and thermostats. Undersized or off-tolerance generic units can overheat, trip thermal cutoffs, and shorten the life of expensive control boards.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wiring). Photograph all wiring connections before disconnecting. Reconnect primary (line) wires first, then secondary (24V) wires.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Designed as a direct OEM fit for the Carrier C50A305064 commercial rooftop/packaged unit. Always verify your unit's control voltage requirements on the data plate before ordering. If your thermostat is blank, your contactor won't pull in, or your system is completely unresponsive despite power at the disconnect, this transformer is the first component to test with a multimeter. In stock and ready to ship — order by 3PM EST for same-day dispatch.