OEM Carrier 40VA Control Transformer for Model C4850C50Z3060600

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50Z3060600 packaged unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage switching circuits. When this component fails, the entire control circuit goes dark — the thermostat becomes unresponsive, the system won't call for heating or cooling, and nothing appears to work even though the unit has power. A failed transformer is one of the most commonly misdiagnosed faults in packaged HVAC systems.

• Specs: 40VA rating | 120V primary / 24V secondary | OEM part number HT01BD236 | Factory-matched impedance and thermal protection for Carrier packaged unit applications
• OEM vs Generic: This factory OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic transformers often cut corners on core lamination and thermal fusing, leading to premature failure under high control-circuit load — especially in packaged units with economizers or multi-stage controls.
• Install difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or terminal connectors. Verify 24V output after installation before restoring full system power. Always label or photograph existing wiring before disconnecting.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day when ordered before 3PM local time.

Compatibility: Designed specifically for the Carrier C4850C50Z3060600 packaged unit. Verify primary voltage (120V) and VA rating on your unit's data plate before ordering. If your system runs a 208/240V primary, do not order this unit — contact our fitment team to confirm the correct part. Questions about compatibility? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order.