OEM Carrier Control Transformer 40VA 120V/24V for Model C50A402061

This is the OEM factory-specified control transformer (part number HT01BD236) for the Carrier C50A402061 commercial packaged unit. The transformer steps line voltage (120V) down to the 24V AC signal required to power your thermostat, control board, contactor coils, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dead — the thermostat goes blank, the unit won't respond to any call for heating or cooling, and you may measure 0V across the 24V secondary terminals. It is one of the first components to check when a unit appears completely non-functional despite normal line voltage at the disconnect.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Factory-matched impedance and thermal protection
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and impedance specifications. Undersized or off-spec generic transformers are prone to overheating, nuisance tripping, and shortened service life — especially in commercial rooftop applications where control loads are higher.
• Install difficulty: 2/5 — Shut off all power at the disconnect before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Photograph or label all wiring connections before removing the old unit. Verify 0V at primary terminals before handling.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier C50A402061 commercial rooftop/packaged unit. Always verify your unit's control voltage and VA requirement on the data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists are available to confirm compatibility before you buy — no guesswork required.