OEM Carrier Transformer 40VA 120V/24V for Model C50A802764

This OEM replacement transformer (part number HT01BD702) is the factory-specified control circuit transformer for the Carrier C50A802764 packaged unit. The transformer steps down line voltage from 120V to the 24V AC signal that powers your thermostat, control board, and all low-voltage system controls. When this component fails, the entire control circuit goes dark — your thermostat goes blank, the system stops responding to calls for heating or cooling, and no safety controls can operate. If your unit is completely unresponsive but line voltage is confirmed present, this transformer is the first component to test.

• Specs: 40VA rating | 120V primary / 24V secondary | Factory OEM part number HT01BD702 | Designed to exact Carrier factory tolerances for reliable low-voltage output
• OEM vs Generic: OEM transformers are wound and rated to Carrier's exact VA and voltage specifications. Undersized or off-tolerance generic units can overheat, trip the internal fuse, or deliver unstable 24V output that causes nuisance faults on the control board.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 0V at the primary leads before handling. Label all wiring prior to disconnecting the old unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A802764 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you have any questions about fitment, our HVAC parts specialists confirm compatibility before your order ships — no guesswork required.