OEM Carrier Control Transformer 40VA 120V to 24V for Model C48A505062

This OEM control transformer is the factory-specified replacement for the Carrier C48A505062 packaged unit. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, contactor coil, gas valve, and control board. When it fails, the entire control circuit goes dark — your thermostat goes blank, the system won't respond to calls for heating or cooling, and no fault codes appear because the board itself has no power. If your system is completely unresponsive and you've confirmed 120V supply voltage at the unit, a failed transformer is the most likely culprit.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | OEM part numbers HT01BD236 and HT01BD702 — direct factory replacement
• OEM vs Generic: OEM transformers are wound and potted to Carrier's exact VA and voltage tolerances, preventing under-voltage faults that can cause erratic board behavior or nuisance lockouts common with undersized aftermarket units.
• Install difficulty: 2/5 — Shut off power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Verify 0V on primary terminals before touching wiring. Document terminal labeling before disconnecting old unit.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C48A505062 packaged unit. Cross-references OEM part numbers HT01BD236 and HT01BD702. Confirm your existing transformer's VA rating and primary/secondary voltages on the data plate before ordering. Our parts specialists are available to verify fitment — reach out before you buy for complete peace of mind.