OEM Carrier Control Transformer 40VA for Model C4850C50AY05061

This OEM replacement control transformer (part# HT01BD236) is the factory-specified unit for the Carrier C4850C50AY05061 packaged heating and cooling system. The transformer steps down line voltage (120V) to the 24V AC signal required by the thermostat, control board, contactor coil, and all low-voltage control circuits. When this component fails, the entire control circuit loses power — the thermostat goes blank, the system won't respond to any commands, and no heating or cooling can be initiated. A failed transformer is often mistaken for a thermostat or control board failure, making it a critical first diagnostic step.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 transformer | Direct OEM replacement | Part# HT01BD236 | Factory-matched output tolerance for stable low-voltage control signal
• OEM vs Generic: This OEM Carrier transformer is wound and insulated to factory specifications, ensuring correct VA capacity under full load. Undersized or generic transformers can brown out under peak demand — triggering nuisance lockouts and premature control board failure.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label and photograph all wiring connections before disconnecting. Typical install time: 20–30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier C4850C50AY05061 packaged unit. Always verify your existing transformer's VA rating and primary/secondary voltage on the unit data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — just reach out before you buy. Order now and get same-day shipping!