OEM Carrier 40VA Control Transformer for Model C4850C50Z2030900

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50Z2030900 packaged unit. The transformer steps down 120V primary voltage to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the result is total system non-response: the thermostat goes dark, nothing calls for heating or cooling, and the unit appears completely dead. A blown transformer is often caused by a short in the 24V control wiring, so always inspect low-voltage circuits before installing a replacement.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-matched impedance for stable control voltage under load
• OEM vs Generic: OEM transformers like the HT01BD236 are wound and rated to Carrier's exact specifications, ensuring stable 24V output under full load. Generic units frequently under-deliver on VA capacity, causing nuisance tripping and premature failure of connected control boards.
• Install difficulty: 2/5 — Disconnect power at the breaker and confirm voltage is absent before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label all wiring before removal and verify 24V output after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier C4850C50Z2030900 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or existing component label before ordering. Our fitment specialists are available to confirm compatibility — reach out before you order if you have any questions. Order by 3PM local time and your part ships today.