OEM Carrier Control Transformer 40VA 120V–24V for Model C50A402764

This is the factory OEM replacement transformer (part number HT01BD702) designed specifically for the Carrier C50A402764 packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and all safety controls. When the transformer fails, nothing in the system responds: the thermostat goes blank, the contactor won't pull in, and the unit sits completely dead despite power being present at the disconnect. A failed transformer is often caused by a short in the low-voltage wiring or a failed component that draws excess current, so always inspect the control circuit before installing a replacement.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 control transformer | Direct OEM replacement, part number HT01BD702 | Factory-matched electrical characteristics
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerances. Undersized or off-spec generic transformers can overheat under normal control-circuit loads, leading to repeat failures and potential damage to downstream components including the control board.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning work. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wires before disconnecting and verify 24V output with a multimeter after installation before restoring full power.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our national warehouse network.

Compatibility: Engineered as a direct OEM fit for the Carrier C50A402764 commercial packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us before placing your order.