OEM Carrier Control Transformer 40VA 120V/24V for Model C4850C50AW06051

This is the factory OEM replacement control transformer (part number HT01BD236) for the Carrier C4850C50AW06051 packaged unit. The transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When it 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 staging occurs. A blown transformer is often the first sign of a short elsewhere in the low-voltage wiring, so always inspect the circuit before replacing.

• Specs: Primary voltage: 120VAC | Secondary voltage: 24VAC | VA rating: 40VA | OEM part number: HT01BD236 | Factory-matched output for Carrier low-voltage control circuits
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA rating and insulation class. Generic transformers may be undersized in VA output, causing voltage sag under load that triggers nuisance lockouts or damages the control board over time.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Verify 24VAC output with a multimeter after installation before restoring low-voltage connections. Always check for shorts in the thermostat wiring that may have caused the original failure.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier C4850C50AW06051 packaged unit. Verify your existing transformer's primary/secondary voltage and VA rating against your unit's data plate before ordering. If you have questions about fitment, our HVAC parts specialists verify compatibility before you order — no guesswork. In stock and ready to ship today.