OEM Carrier 60VA Control Transformer 115/208/230V–24V for Model PH13NA04200GABAA

This is the OEM factory-specified control transformer (part number HT01AW229) for the Carrier PH13NA04200GABAA heat pump system. The transformer steps down the 115/208/230V line voltage to the 24V signal used by the control board, thermostat, contactor coil, and safety switches. When this transformer fails, the entire low-voltage control circuit goes dead — the thermostat will appear unresponsive, the system won't energize, and no error codes will display because the board itself has no power. It is one of the most overlooked components in a no-operation diagnosis.

• Specs: 60 VA power rating | 115/208/230 VAC primary | 24 VAC secondary | 50/60 Hz | Foot-mounted configuration | Factory-matched OEM tolerances
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part. Generic transformers often use thinner copper windings and lower-grade cores, increasing the risk of overheating under sustained load — especially in systems with multiple zones or accessories drawing from the 24V circuit.
• Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before replacing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label all low-voltage wires before disconnecting. Transformer failure can sometimes be caused by a downstream short — check the low-voltage wiring and board fuse before powering back up.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH13NA04200GABAA heat pump systems. Also fits Bryant and Payne units that call for the HT01AW229 / HT01AW229A transformer. Verify your existing transformer's VA rating, primary voltage, and mounting style against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy.