OEM Carrier Control Transformer 40VA for Model C4850C50Z8075610

This OEM control transformer (part# HT01BD236) is the factory-specified replacement for the Carrier C4850C50Z8075610 packaged unit. The transformer steps line voltage (120V) down to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When this component fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any call for heating or cooling, and no error codes are displayed because the board itself has no power. A failed transformer is often misdiagnosed as a bad thermostat or control board, making correct identification critical before replacing more expensive components.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Class 2 control circuit transformer | OEM Part Number: HT01BD236
• OEM vs Generic: This OEM transformer is wound to exact Carrier factory specifications, ensuring proper VA capacity and voltage regulation. Undersized or off-tolerance generic transformers can overheat, blow internal fuses, and damage downstream control boards — a costly consequence of a cheap repair.
• Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output after install). Label or photograph all wire connections before removal. Check for a shorted load (e.g., stuck contactor coil) that may have caused the original failure.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C4850C50Z8075610 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. If you have questions about fitment, our HVAC parts specialists verify compatibility before you buy — no guesswork required.