OEM Carrier Transformer 40VA 120V/24V for Model C4850C48ZN105610

This is the factory OEM replacement transformer (part number HT01BD236) for the Carrier C4850C48ZN105610 packaged unit. The transformer steps down line voltage (120V) to the 24V control circuit voltage that powers your thermostat, contactor coil, gas valve, and all low-voltage controls. When this transformer fails, nothing in the control circuit responds — the thermostat goes blank, the system won't call for heating or cooling, and you may find a blown fuse on the control board from a secondary short. Replacing it with the correct OEM unit restores full control circuit operation immediately.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Factory-matched output for Carrier C4850C48ZN105610 packaged units | OEM part number HT01BD236
• OEM vs Generic: The OEM HT01BD236 is wound and encapsulated to Carrier's exact VA and voltage tolerances. Generic transformers often deliver inconsistent secondary voltage, which can cause nuisance tripping, contactor chatter, or premature control board failure — false savings that cost more in the long run.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label or photograph all control wiring before disconnecting. Always check for a secondary short-to-ground before powering up the new transformer to avoid repeat 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 C4850C48ZN105610 packaged unit. Verify your existing transformer's primary voltage, secondary voltage, and VA rating against your unit's data plate before ordering. If you're unsure, our HVAC parts specialists can confirm fitment — just reach out before you order. In stock and ready to ship today.