OEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AJ04061

This is the factory OEM replacement transformer (part# HT01BD236) for the Carrier C4850C50AJ04061 packaged unit. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and safety controls. When this transformer fails, the result is total control circuit loss: the thermostat goes dark, the system won't respond to any calls for heating or cooling, and nothing turns on. It is often the first component to suspect when all controls are dead but the disconnect is live.

• Specs: Input 120V AC | Output 24V AC | 40VA rated | OEM part number HT01BD236 | Factory-matched primary/secondary windings with internal thermal fuse protection
• OEM vs Generic: The OEM HT01BD236 transformer is wound to Carrier's exact VA rating and insulation class, ensuring stable 24V output under full control-circuit load. Generic transformers frequently underrate their VA capacity, causing voltage sag that triggers nuisance lockouts and premature contactor coil failure.
• Install difficulty: 2/5 — Turn off power at the disconnect and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wiring before disconnecting. The transformer mounts to the control panel with two screws; primary and secondary wires use push-on or screw terminals depending on revision.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before 3PM local time ship same business day from our climate-controlled parts warehouse.

Compatibility: Designed specifically for the Carrier C4850C50AJ04061 packaged unit. Verify your existing transformer's input voltage, output voltage, and VA rating on its label before ordering to confirm an exact match. Have your model and serial number ready — our parts specialists are available to confirm fitment before you buy. In stock and ready to ship today.