OEM Carrier Transformer 40VA 120V to 24V for Model PH13NR03600GAJAA

This OEM control transformer (part number HT01AW229) is the factory-specified replacement for the Carrier PH13NR03600GAJAA heat pump system. The transformer steps down 120V line voltage to the 24V low-voltage signal used to power the thermostat circuit, control board, and all relay coils throughout the system. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the contactor coil cannot energize, and the system will not respond to any call for heating or cooling. If your unit is completely unresponsive despite having line voltage at the unit, a failed transformer is one of the first components to test.

• Specs: Input: 120V AC | Output: 24V AC | VA Rating: 40VA | OEM Part Number: HT01AW229 | Factory-matched footprint and wire gauge for direct drop-in replacement
• OEM vs Generic: This is the genuine OEM Carrier transformer, wound to exact factory VA and voltage specifications. Generic transformers frequently carry loose tolerances that can under-power sensitive control boards or overheat under full relay load, risking secondary component damage.
• Install Difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Photograph or label all low-voltage wiring before disconnecting. Most technicians complete this swap in under 30 minutes.
• Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH13NR03600GAJAA heat pump. Always verify input voltage and VA rating on your unit's wiring diagram or data plate before ordering. Have a question about fitment? Our HVAC parts specialists are available to confirm compatibility before you buy — order with confidence and get back up and running today.