OEM Carrier 40VA Control Transformer HT01BD702 for Model C50A502064

This OEM Carrier transformer (part number HT01BD702) is the factory-specified replacement for the C50A502064 commercial packaged unit. The control transformer steps down line voltage (120V) to the 24V signal required by your thermostat, control board, contactor coils, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dark — the thermostat shows no power, the system won't respond to any commands, and nothing operates at all.

• Specs: 40VA rated | 120V primary / 24V secondary | Step-down configuration | Factory-matched OEM tolerances for reliable low-voltage control circuit performance
• OEM vs Generic: This is the genuine Carrier OEM transformer, engineered to exact VA and voltage tolerances for the C50A502064. Generic transformers often use undersized windings that overheat under full low-voltage load, leading to premature failure and potential control board damage.
• Install Difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (verify 0V before touching wiring). Label all low-voltage wires before disconnecting. A blown fuse on the secondary side often indicates a downstream short — inspect wiring before installing the new transformer.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Engineered for the Carrier C50A502064 commercial rooftop/packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment — reach out before you order if you have any questions. In stock and ready to ship today.