OEM Carrier 40VA Control Transformer for Model C4850C50Z6075610 (Part# HT01BD236)

This is the OEM factory-replacement control transformer (part number HT01BD236) for the Carrier C4850C50Z6075610 packaged unit. The transformer steps down line voltage from 120V to 24V AC, powering the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this transformer fails, nothing in the system responds: the thermostat goes blank, the unit won't call for heating or cooling, and you may measure zero volts at the secondary terminals. It is often the first component to inspect when diagnosing a completely unresponsive system.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | Foot-mount design | Factory-matched to Carrier C4850C50Z6075610 control circuit requirements
• OEM vs Generic: OEM transformers (HT01BD236) are wound and rated to exact Carrier factory specifications, ensuring the full 40VA load capacity is available without voltage sag under simultaneous relay and valve energization — a common weak point of generic substitutes.
• Install difficulty: 2/5 — Disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wiring connections before removal. Confirm 24V output with a multimeter after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50Z6075610 packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — order with confidence or contact us before purchasing.