OEM Carrier Control Transformer 40VA 120V/24V for Model PH13NR03000GAJAA

This OEM replacement transformer (part number HT01AW229) is the factory-specified control circuit transformer for the Carrier PH13NR03000GAJAA heat pump system. Its job is to step down line voltage (120V) to the 24V AC signal that powers your thermostat, contactor coil, and all low-voltage control components. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the system won't respond to any calls for heating or cooling, and you may measure 0V at the R and C terminals on your control board. Using the exact OEM part ensures the transformer meets factory VA rating tolerances and fits the original mounting footprint without modification.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | OEM part number: HT01AW229 | Factory-matched form and fit
• OEM vs Generic: This is the genuine Carrier OEM transformer, wound to exact factory VA and voltage specifications. Generic transformers can run under-rated VA, causing coil overheating, nuisance tripping, and premature failure of downstream low-voltage components.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: Phillips and flathead screwdrivers, nut driver, multimeter. Label all low-voltage wires before disconnecting. Verify 24V output at secondary terminals before reassembly.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the factory replacement for Carrier model PH13NR03000GAJAA. Confirm your existing transformer's primary/secondary voltage and VA rating on the unit data plate before ordering to ensure proper fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork required.