OEM Carrier Control Transformer 40VA for Model C4850C50ZN030600

This OEM replacement control transformer (part# HT01BD236) is the factory-specified unit for the Carrier C4850C50ZN030600 packaged system. The transformer steps down 120V line voltage to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When it fails, nothing in the system responds: the thermostat goes blank, the unit won't call for cooling or heating, and you may detect a burning smell near the air handler or unit cabinet.

• Specs: 40VA rating | Primary voltage: 120V AC | Secondary voltage: 24V AC | OEM part number HT01BD236 | Compatible with R-410A packaged systems
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications, ensuring proper VA capacity and insulation rating. Undersized generic transformers can overheat under peak control-circuit load, causing repeated nuisance failures and potential board damage.
• Install difficulty: 2/5 — Disconnect all power before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before touching wires). Photograph all low-voltage wiring connections before removal. Most techs complete this swap in under 30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our climate-controlled warehouse.

Compatibility: Engineered for the Carrier C4850C50ZN030600 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or existing part label before ordering. If your control circuit has experienced a short, inspect low-voltage wiring for damage before installing the replacement to prevent immediate re-failure. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — reach out via chat or phone.