OEM Carrier Transformer 40VA 120V/24V for Model C4850C48ZG055500

This is the factory-specified OEM control transformer (part number HT01BD236) for the Carrier C4850C48ZG055500 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, contactor coil, and all low-voltage control circuits. When the transformer fails, absolutely nothing in the control system responds — the thermostat goes blank, the unit won't call for heating or cooling, and there is no 24V measured at the secondary terminals. A blown transformer is often caused by a short in the low-voltage wiring, so always inspect the full 24V circuit before replacing.

• Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD236 | Designed to factory fit and terminal configuration for Carrier C4850C48ZG055500
• OEM vs Generic: The OEM HT01BD236 transformer is wound to exact VA and voltage tolerance specifications. Generic alternatives may be undersized in VA rating, causing premature thermal cutout trips or nuisance failures when multiple 24V accessories are connected simultaneously.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output and check for downstream shorts). Always identify and correct any wiring short before installing the new transformer to prevent repeat failure.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model C4850C48ZG055500 packaged units. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate before ordering. Our parts specialists are available to verify fitment — order with confidence and get your system back online fast.