OEM Carrier Control Circuit Transformer 40VA for Model C50A206051

This OEM replacement transformer (part number HT01BD236) is the factory-specified control circuit transformer for the Carrier C50A206051 commercial packaged unit. The transformer steps down line voltage from 120V to the 24V signal required by the thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — nothing responds, no modes operate, and the system appears completely dead even with power present at the unit.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | Class 2 control circuit transformer | Factory-matched OEM replacement | Terminal block connections
• OEM vs Generic: The OEM HT01BD236 transformer is wound to exact Carrier factory specifications, ensuring stable 24V output under full load. Generic transformers frequently deliver undervoltage at peak demand, causing nuisance lockouts, contactor chatter, and premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the disconnect before starting. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output after install), wire stripper. Label or photograph all low-voltage wiring connections before removal to ensure correct reinstallation.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed for the Carrier C50A206051 commercial rooftop/packaged unit. Verify your existing transformer's VA rating and primary/secondary voltage from the unit data plate or old component label before ordering. If your control circuit shows 24V issues — erratic thermostat behavior, contactor not pulling in, or board faults — test transformer output with a multimeter before replacing downstream components. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy.