OEM Carrier 40VA Control Transformer for Model KMABA02014TG — Part HT01BC116

This OEM replacement transformer (part number HT01BC116) is the factory-specified control circuit transformer for the Carrier KMABA02014TG. It steps down 120V line voltage to the 24V signal that powers your thermostat, control board, and all low-voltage switching logic. When the transformer fails, nothing in your system responds — the thermostat goes blank, no relays click, and the unit won't call for heating or cooling at all. It's one of the most overlooked causes of a completely unresponsive HVAC system.

• Specs: 40VA rated | 120V primary / 24V secondary | Class 2 low-voltage output | Hardwired lead connections | Factory-matched impedance for Carrier control circuits
• OEM vs Generic: The OEM HT01BC116 transformer is wound and insulated to Carrier's exact VA tolerance and thermal ratings. Generic substitutes frequently underperform under load, causing erratic low-voltage behavior, nuisance lockouts, or premature board failure — costing more in follow-up repairs than the part itself.
• Install difficulty: 2/5 — Turn off power at the breaker and disconnect the furnace disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph existing lead connections before removing the old transformer.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier KMABA02014TG. Always verify the transformer VA rating and primary/secondary voltage on your unit's data plate or existing transformer label before ordering. If you're unsure of fitment, our parts team can confirm compatibility before you purchase — just reach out via chat or phone. Order now and get same-day shipping on all in-stock parts.