OEM Carrier Control Transformer 40VA 120V/24V for Model PH12NA03600GACAA

This OEM control transformer (part HT01AW229) is the factory-specified replacement for the Carrier PH12NA03600GACAA heat pump system. The transformer steps down 120V line voltage to the 24V signal voltage required to power the control board, thermostat circuit, and all low-voltage switching components. When this transformer fails, the entire control circuit goes dead — the thermostat will appear unresponsive, no contactor will pull in, and the system will not heat or cool regardless of demand.

• Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01AW229 | Factory-matched output tolerance for reliable control circuit operation
• OEM vs Generic: This is a genuine Carrier OEM transformer, wound to exact factory VA and voltage specifications. Generic transformers may be under-rated in VA, causing premature burnout under full low-voltage load — especially on systems with zone controls or communicating thermostats.
• Install Difficulty: 2/5 — Disconnect all power before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all 24V wiring connections before removal. Verify output voltage with a multimeter after installation before reassembling the unit.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PH12NA03600GACAA heat pump. Always verify the VA rating and primary/secondary voltages on your unit's data plate or wiring diagram before ordering to ensure correct fitment. Our technical team is available to confirm compatibility before you buy.