OEM Carrier Control Transformer 60VA 115/208/230V–24V for Model PH12NA042000AAAA

This OEM control transformer (part number HT01AW229) is the factory-specified replacement for the Carrier PH12NA042000AAAA packaged heat pump unit. The transformer steps down the 115/208/230V line voltage to the 24V AC signal that powers every component in the control circuit — thermostat, contactor coil, reversing valve solenoid, and safety relays. When the transformer fails, the entire control circuit goes dead: the thermostat loses power, nothing responds to a call for heating or cooling, and the system appears completely unresponsive even with line voltage confirmed at the disconnect.

• Specs: 60 VA power rating | 115/208/230V AC primary (multi-tap) | 24V AC secondary | 50/60 Hz | Foot-mounted chassis | Factory OEM tolerance
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part (FAP), manufactured to exact VA rating and insulation class. Generic transformers often run at lower VA ratings or looser tolerances, risking nuisance tripping, overheating, or premature failure under full control-circuit load.
• Install difficulty: 2/5 — Always disconnect power at the breaker and verify zero voltage before touching any terminals. Tools needed: multimeter, flat-head and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all wires before disconnecting. Confirm primary tap matches your supply voltage (115V, 208V, or 230V).
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH12NA042000AAAA packaged heat pump units. The multi-tap primary (115/208/230V) makes this transformer compatible across a range of supply voltages — verify your unit's data plate before ordering. Cross-references include HT01AW229A. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — call or chat today.