OEM Carrier 40VA Control Transformer HT01BD236 for Model C50A305052

This OEM Carrier control transformer (part number HT01BD236) is the factory-specified replacement for the C50A305052 packaged unit. The transformer steps down 120V line voltage to the 24V signal required by the control circuit, thermostat, and low-voltage components throughout the system. When this transformer fails, the entire control circuit goes dead — the thermostat will show no response, the system will not call for heating or cooling, and nothing will operate despite power being present at the unit.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Factory-matched OEM replacement for part number HT01BD236
• OEM vs Generic: OEM transformers are wound to exact VA and voltage specifications required by Carrier's control board. Undersized or off-spec generic units can cause erratic thermostat behavior, nuisance tripping of the 3A fuse, and premature control board failure.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed for use in the Carrier C50A305052 commercial packaged rooftop unit. Always confirm the transformer's VA rating and primary/secondary voltage against your unit's wiring diagram and data plate before ordering. Our HVAC parts specialists are available to verify fitment prior to purchase — ensuring you get the right part the first time and avoid costly downtime.