OEM Carrier 40VA Control Transformer for Model C48A505052

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Carrier C48A505052 packaged unit. The transformer converts 120V line voltage to the 24V signal required to power the entire control circuit — including the thermostat, contactor coil, gas valve, and control board. When the transformer fails, nothing in the system responds: the thermostat goes dark, the unit won't call for heating or cooling, and you may detect a faint burning smell or a tripped secondary fuse.

• Specs: 40VA rating | Primary voltage: 120V | Secondary voltage: 24V | OEM part number HT01BD236 | Mounts via standard bracket to control panel
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances. Generic alternatives often under-deliver on VA capacity, causing nuisance tripping, overheating, and premature failure — especially under heavy control-circuit loads common in packaged units.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Always label wires before disconnecting and check for a shorted secondary before installing a new transformer.
• Warranty: 1-year OEM factory warranty. Orders placed by 3PM ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C48A505052 packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. If you're replacing a repeatedly failed transformer, inspect downstream components for shorts to protect your new part. Have a fitment question? Our HVAC parts specialists verify compatibility before you order.