OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C50Z9075610

This is the factory OEM replacement transformer (part number HT01BD236) for the Carrier C4850C50Z9075610 packaged unit. The control transformer steps down line voltage (120V) to the 24V AC signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When the transformer fails, the entire control circuit goes dead — your thermostat loses power, the system won't respond to any calls for heating or cooling, and you may blow a 3A or 5A control fuse repeatedly. Replacing the transformer is one of the fastest, most cost-effective repairs in HVAC service.

• Specs: 40VA rated | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched output for reliable low-voltage control circuit operation
• OEM vs Generic: This OEM Carrier transformer is wound to exact factory VA and voltage specifications. Generic transformers often run underrated VA, causing premature overload trips and repeated fuse failures under normal system load.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Tools needed: Phillips and flat-head screwdrivers, needle-nose pliers, multimeter (to verify 24V output after installation). Photograph or label all low-voltage wiring prior to disconnecting terminals. Always check for a shorted low-voltage wiring harness before installing the new transformer to avoid immediate failure.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our climate-controlled warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50Z9075610 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Not sure if this part fits your system? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order. In stock and ready to ship today.