OEM Carrier Transformer 120V/24V 40VA for Model PH13NR01800GACAA

This is the factory-specified OEM replacement transformer (part # HT01AW229) for the Carrier PH13NR01800GACAA heat pump system. The transformer steps down line voltage (120V) to the 24V control voltage that powers your thermostat, control board, and all low-voltage switching circuits. When the transformer fails, the entire control circuit goes dead — your thermostat will go blank, the system will not respond to any calls for heating or cooling, and no safety or staging logic will function. It is one of the first components to check when nothing works despite confirmed line power at the unit.

• Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | Factory OEM part number: HT01AW229 | Built-in thermal overload protection (varies by revision)
• OEM vs Generic: This OEM transformer is wound and rated to Carrier's exact factory specification, ensuring correct VA capacity and voltage tolerance. Generic transformers may underperform under full load, tripping overloads prematurely and causing intermittent no-power faults.
• Install difficulty: 2/5 — Disconnect all power before servicing. Tools needed: multimeter (verify 24V output before re-energizing), flathead and Phillips screwdrivers, wire nuts or spade terminals. Always label wires before removal. Test secondary voltage output before closing the panel.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PH13NR01800GACAA. Always verify your unit's data plate voltage requirements and VA load before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions. Order today and get same-day shipping on in-stock parts.