OEM Carrier Control Transformer 40VA for Model C4850C50Z2090610

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50Z2090610 packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage required by the thermostat, control board, contactor coil, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dark — your thermostat will appear dead, the system will not respond to any calls for heating or cooling, and no fault codes will display because the board itself has no power.

• Specs: 40VA capacity | Primary: 120V AC | Secondary: 24V AC | Class 2 rated | Replaces OEM part number HT01BD236
• OEM vs Generic: This factory OEM transformer is wound to exact VA and voltage tolerances for the C4850C50Z2090610 control circuit. Undersized or off-tolerance generic transformers can overload under simultaneous relay and board draws, causing nuisance trips and premature failure of downstream components.
• Install difficulty: 3/5 — Disconnect power at the disconnect box and verify zero voltage with a multimeter before opening the unit. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label all low-voltage wiring before disconnecting; incorrect wiring on reinstall can damage the control board.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day when ordered before 3 PM local time.

Compatibility: Designed specifically for the Carrier C4850C50Z2090610 packaged unit. Always verify primary voltage, secondary voltage, and VA rating on your unit's data plate or existing transformer label before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.