OEM Carrier 40VA Control Transformer for Model KMABA01013TG — Part HT01BC116

This OEM control transformer is the factory-specified replacement for the Carrier KMABA01013TG air handler. The transformer steps down line voltage (120V) to the 24V signal used by your thermostat and all low-voltage control components. When this part fails, the entire control circuit goes dead — your thermostat shows no power, no heating or cooling calls are made, and the system appears completely unresponsive. A bad transformer is one of the most commonly misdiagnosed HVAC failures, often mistaken for a bad thermostat or control board.

• Specs: 40VA rated | 120V primary / 24V secondary | OEM part number HT01BC116 | Factory-matched output for reliable low-voltage control circuit operation
• OEM vs Generic: This OEM transformer is wound to Carrier's exact VA and voltage tolerances. Generic transformers often run undersized VA ratings, causing voltage sag under load and nuisance tripping of control boards — especially in multi-stage or communicating systems.
• Install Difficulty: 2/5 — Shut off power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 24V output after install). Label or photograph all wiring before disconnecting. Always check for a shorted secondary circuit (blown fuse, failed board) before installing the new transformer.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier KMABA01013TG air handler units. Confirm your unit's data plate shows 120V/24V control transformer before ordering. If you're unsure of fitment, our parts team verifies compatibility before you buy — order with confidence and get back to comfort fast.