OEM Carrier Control Transformer 40VA for Model C48A302552

This is the OEM factory-replacement control transformer (part number HT01BD236) for the Carrier C48A302552 packaged unit. The transformer steps down 120V line voltage to 24V to power the entire low-voltage control circuit — including the thermostat, contactor coil, and safety switches. When it fails, nothing works: the thermostat goes dark, the system is completely unresponsive, and the unit will not call for heating or cooling under any condition.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched for Carrier C48A302552 control circuit requirements
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for your unit. Generic alternatives often run at the edge of VA capacity, causing nuisance tripping of the secondary fuse or premature failure under peak control-circuit loads.
• Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 0V at the primary terminals before handling. Photograph all wiring connections before disconnecting. Replacement typically takes 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Carrier C48A302552 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit's data plate or wiring diagram before ordering. If your thermostat and controls are completely unresponsive despite a good 120V supply, this transformer is the most likely cause. Order with confidence — our parts specialists verify fitment before every order ships.