OEM Carrier 40VA Control Transformer HT01BD236 for Model C4850C50AK06061

This is the factory OEM replacement transformer (part# HT01BD236) for the Carrier C4850C50AK06061 packaged unit. The transformer steps down 120V line voltage to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and no error codes will display because the board itself has no power. A failed transformer is often mistaken for a control board failure, making it one of the first components to verify during a no-power diagnostic.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM Part# HT01BD236 | Factory-matched impedance and thermal protection
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact factory specification. Generic aftermarket units frequently underperform on VA capacity, causing intermittent brownouts on the 24V circuit, nuisance lockouts, and premature control board failure due to voltage fluctuation.
• Install difficulty: 2/5 — Disconnect power at the disconnect box and confirm zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all 24V wiring connections before removal. Transformer mounts with two screws and uses spade or wire-lead connections depending on configuration.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed and factory-specified for the Carrier C4850C50AK06061 packaged unit. Always verify your existing transformer's VA rating, primary voltage, and secondary voltage on the data plate or original component label before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you purchase — no guesswork required. Order today and get same-day shipping on this in-stock OEM part.