OEM Carrier Control Transformer 40VA 120V to 24V for Model C48A302561

This OEM replacement control transformer (part number HT01BD236) is the factory-specified unit for the Carrier C48A302561 packaged system. The transformer steps line voltage (120V) down to the 24V signal voltage required to power your thermostat, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system won't respond to any calls for heating or cooling, and no fault codes are displayed because the board itself has no power to operate.

• Specs: 40VA rated | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Factory-matched construction for Carrier packaged systems
• OEM vs Generic: This is the genuine OEM Carrier transformer, wound to exact VA and voltage specifications. Generic transformers frequently under-deliver on VA capacity, causing control boards to brown out under full load and shortening the life of connected components.
• Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Always verify 0V at primary terminals before handling. Label all low-voltage wiring before disconnecting to ensure correct reassembly.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C48A302561 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. If your system exhibits a completely unresponsive thermostat, no LED activity on the control board, or a blown fuse on the low-voltage circuit, this transformer is the most common root cause. Our parts specialists are available to confirm fitment before you order — order with confidence and get back to comfort fast.