OEM Carrier Control Transformer 60VA 115/208/230V–24V for Model PH12NA03000GABAA

This OEM control transformer (part number HT01AW229) is the factory-specified replacement for the Carrier PH12NA03000GABAA. The transformer steps down line voltage (115, 208, or 230 VAC primary) to the 24 VAC secondary signal that powers the entire low-voltage control circuit — including the thermostat, contactor coil, safety switches, and control board. When this transformer fails, the result is typically a completely unresponsive system: no thermostat display, no contactor pull-in, and no operation whatsoever. A failed transformer is often misdiagnosed as a control board failure, making it a critical first check.

• Specs: 60 VA power rating | 115/208/230 VAC primary voltage | 24 VAC secondary output | 50/60 Hz | Foot-mounted configuration | Factory OEM part number HT01AW229
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part — not an aftermarket substitute. OEM transformers are wound to exact VA and voltage specifications, ensuring proper inrush current handling and long-term reliability. Generic alternatives may under-deliver VA capacity, causing nuisance tripping or premature burnout.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter, wire nuts. Label all low-voltage wires before disconnecting. Verify primary voltage tap matches your line voltage before energizing.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH12NA03000GABAA. Also cross-references to Bryant and Payne systems using the same 60VA 115/208/230V–24V control transformer specification. Always verify your unit's data plate voltage and VA rating before ordering. Our parts specialists are available to confirm fitment — contact us before you buy.