OEM Carrier Control Transformer 40VA for Model C4850C50ZN070600

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C4850C50ZN070600 packaged unit. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, contactor coil, gas valve, and all other low-voltage control components. When this transformer fails — due to a shorted control wire, failed component, or age — absolutely nothing in the control circuit will respond: no heat, no cooling, no fan, and a blank or unresponsive thermostat. It is often the first component to check when the system appears completely dead despite the breaker being on.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 output | Factory-matched to OEM control board requirements | OEM Part No. HT01BD236
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact specifications. Generic aftermarket transformers often underrate VA capacity, leading to premature failure under normal control circuit loads — especially in multi-stage or multi-zone systems.
• Install Difficulty: 2/5 — Shut off all power at the breaker and disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before removal. Verify 24V output with a multimeter after installation before restoring full system power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement transformer for the Carrier C4850C50ZN070600 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions.